Ethylene glycol, also known as monoethylene glycol meg, is a major chemical commodity, widely used in the production of polyethylene terephthalate pet bottlegrade resins and polyester fibers. Ethylene glycol demand has increased by 67% year 2004. The oxidative carbonylation of methanol to dimethyl oxalate provides a promising approach to the production of c 1based ethylene glycol. In the first section, ethylene oxide is produced by ethylene direct oxidation reactions from the study by lou et al. Ethylene glycol process is a long process, which includes more than ten fractionating columns and fixedbed catalytic reactor. It is an important raw material for the number of industrial applications including manufacturing of polyester fiber. Among these products, ethylene glycol eg is an important bulk chemical with an annual production and consumption of more than 20 million tons 6. The model of catalytic reactor of ethylene glycol production. The deactivation and swelling of the catalyst during the process were detected.
The mathematical model of the reactor with determined parameters adequately describing the rate of the reaction, product. During ripening, leaco1 and leaco4 are sustained in expression, whereas the increase in leaco3 expression is transient barry and others 1996. This ethylene glycol eg report is a supplement to three previous process economics. The equipment elements in a simplified process flow diagram are discussed. In the early 1960th the production of ethylene oxide based from ethanol and chlorohydrin was not considered cost effective. Raw material for meg production is ethylene and oxygen. Product value of eg as a function of plant operating level and plant capacity 530 6. Here, an interesting catalytic process was reported related to converting cellulose into ethylene glycol eg and ethylene glycol monoether egme in methanol over a runbopo4 catalyst, with the cleavage of a cc bond by nbopo4 and.
Process economics program report 2i ethylene glycol. Environmental releases19 ethylene glycol production or the use of ethylene glycol or products containing ethylene glycol could result in the release of this material to the environment through various waste streams. Historically, about 20 percent of the ethylene glycol was consumed in antifreeze applications. The most popular process for the manufacture of ethylene glycol is the direct hydration of ethylene oxide via the reaction. The objective of the project is the production of fibre grade mono ethylene glycol meg for merchant sale. Water from the process of hydrolysis is evaporated from the mixture and reused. In the process of making ethylene oxide and ethylene glycol, ethylene and oxygen react in the presence of a silver catalyst to form ethylene oxide and co 2. Production of ethylene glycol and its monoether derivative. As a prevalent industrial product, this c2 diol finds widespread applications in different fields, for example, as a solvent, antifreeze agent and precursor for the manufacture of polyester fibres. Ethylene glycol has become one of the worlds important industrial chemicals. Sigmaaldrich offers a number of poly ethylene glycol products. Figure 4 summarizes the production processes for both ethylene glycol eg and propylene glycol pg based antifreeze solutions. This process harnesses synthesis gas syngas, made from coal, to produce ethylene.
Net production cost and product value of eg as a function of ethylene price 529 5. Ethylene glycol used to be manufactured by the hydrolysis of ethylene oxide eo which was produced via ethylene chlorohydrin but this. Historically, about 20 percent of the ethylene glycol was consumed in. Another major market is in the manufacture of polyesters for fibers and foils. Ethylene glycol eg production and manufacturing process. Glycol production pdf, ethylene glycol uses, monoethylene glycol process flow. The efficient usage of lignocellulosic biomass is of great significance for largescale lowcost biomass conversion to biofuels and other useful chemicals. The ethylene oxide hydration process in a catalytic fixed bed tube reactor was studied. Hydration of ethylene oxide is a conventional thermal process for.
On a worldwide basis, approximately twothirds of ethylene glycol is used as a. Ethylene glycol has become the most important ethylene derived industrial chemical of the world. In the long process, there are many uncertain factors, such as. The diagram shows the production of ethylene oxide via direct oxidation of ethylene caption oxidation. Pdf production of ethylene glycol from coal researchgate. Ethylene glycol and glycolic acid production from xylonic. Diethylene glycol deg and triethylene glycol teg are obtained as coproducts in the manufacture of meg from ethylene oxide in some processes. Ethylene glycol and glycolic acid production from xylonic acid by enterobacter cloacae zhongxi zhang1,2,5,yang yang 1,2,5,yike wang 1,2,5,jinjie gu 2,5,xiyang lu 2,xianyan liao 1,jiping shi 2,6, chul ho kim4,gary lye 3,frank baganz 3and jian hao 2,3 abstract. Ethylene glycol and a carbonate ester are simultaneously produced by reacting ethylene oxide and carbon dioxide to form ethylene carbonate, hydrolyzing of the solution containing the ethylene carbonate to obtain ethylene glycol, purifying ethylene glycol, transesterifying ethylene carbonate and a hydroxyl groupcontaining compound to form the corresponding carbonate ester and ethylene glycol. Ethylene glycol basecase process in this paper, the production of ethylene glycol was generated and based on two parts. Human health aspects please note that the layout and pagination of this pdf file are not necessarily identical to the hard copy first draft prepared by r. A crosslinked styrenedivinylbenzene anionexchange resin in the hco 3co 3 2form was used as a catalyst. Names product overview manufacture of product product description product uses exposure potential health information environmental information physical hazard information regulatory information additional information references names cas no. In 1995 the world capacity for ethylene glycol was about 9.
Ethylene oxide production ethylene oxide is a raw material that is used industrially for making many consumer products as well as nonconsumer chemicals and intermediates. This process typically yields about 9092% monoethylene glycol meg and 810% heavier glycol products, mainly diethylene glycol deg and triethylene glycol. Us6380419b2 process for simultaneous production of ethylene. Sep 02, 2014 the efficient usage of lignocellulosic biomass is of great significance for largescale lowcost biomass conversion to biofuels and other useful chemicals. Product safety assessment ethylene glycol butyl ether select a topic. First, the basecase design was obtained, resulting in the production of ethylene glycol via two steps. Ethylene glycol process mitsubishi chemical corporation. These materials, in turn, are used to manufacture textiles, soft drink and water bottles, tire cords and more. The physical properties of ethylene glycolwater mixtures are therefore extremely important. World scale ethylene glycol plant complete plants, process. Most customers require their ethylene to be polymergrade, or 99. Ethylene glycol may be discharged into wastewater from its production and use. Raw ethylene glycol is formed when ethylene oxide is hydrolyzed under pressure at ratio of 10. The present invention relates to a process for the production of ethylene glycol.
Ethylene glycol is a very important chemical and intermediate. Ethylene glycol is odorless, but has a sweet taste. Ethylene glycol production the aqueous eo solution from the ethylene oxide production section is sent to the gylcol section. Ethylene oxide is important or critical to the production of detergents, thickeners, solvents, plastics, and various organic chemicals such as ethylene glycol, ethanol amines. This project report deals with the design calculations of mono ethylene glycol production from ethylene oxide as a feed stock along with their relevant aspects such as instrumentation and process control, hazop study and cost estimation. Product safety assessment ethylene glycol butyl ether. A crosslinked styrenedivinylbenzene anionexchange resin in the hco3co32 form was used as a catalyst. Ethylene glycol used to be manufactured by the hydrolysis of ethylene oxide eo. Ethylene glycol is produced from carbon monoxide in countries with large coal reserves and less stringent environmental regulations. This process typically yields about 9092% monoethylene glycol meg and 810% heavier glycol products, mainly diethylene glycol deg and triethylene glycol teg. Ethylene glycol production chemical engineering page 1.
Ethylene oxide hydration route also produces small amount of the di, tri and. Process analytics in ethylene oxide and ethylene glycol plants. Simulation of ethylene glycol process based on integrated. Monoethylene glycol, diethylene and triethylene glycol are separated using their. In this process of manufacturing meg two coproducts are obtained, diethylene glycol deg and triethylene glycol teg. Us6380419b2 process for simultaneous production of.
According to the licenser, the process is able to achieve eotoeg converstion and selectivity near 100%, leading to production of meg only. Ethylene glycol also is used as a raw material in the production of a. Ethylene glycol manufacture technology free library. July 1, 2014 the dow chemical company page 2 of 7 manufacture of product4 capacity the dow chemical company and its foreign affiliates have the capacity to produce 9. The mono ethylene glycol is use in the cooling project involves the designing of the reactor, agent, lubricant and as a raw material for the evaporator and distillation column. Intensification of ethylene glycol production process sciencedirect. Ethylene oxideethylene glycol nexant subscriptions. In general, an environmentally friendly process with low carbon emissions and waste is desired. An important feature of the process is the negligible production of diethylene glycol deg and triethylene glycol teg, which occur as byproducts in other ethylene glycol production processes. Ethylene glycol and glycolic acid production from xylonic acid by enterobacter cloacae zhongxi zhang 1,2,5,yang yang 1,2,5,yike wang 1,2,5,jinjie gu 2,5,xiyang lu 2,xianyan liao 1,jiping shi 2,6. A novel 2step process abstract ethylene glycol demand is growing rapidly, particularly in the global polyethylene terephthalate markets. Ec is produced from eo using a phosphonium halide catalyst the overall result of the two step process is that meg yield in ethylene glycols product is extremely. Physical properties the chemical formula for ethylene glycol is c 2 h 6 o 2, and its molecular weight is 62.
Ethylene glycol eg production and manufacturing process 20101224 ethylene glycol used to be manufactured by the hydrolysis of ethylene oxide eo which was produced via ethylene chlorohydrin but this method has been superseded by a direct oxidation route. In the early days of eo production, the typical startofcycle selectivity for eo catalysts ranged from 68 to 70%, i. This excess of water helps to reduce byproduct formation. Monoethylene glycol, diethylene and triethylene glycol are separated using their different boiling points under vacuum. A new process for glycine production by antisolvent. Selective catalytic twostep process for ethylene glycol from. Initially, fresh ethylene, methane makeup and oxygen are mixed with recycle gas recovered downstream. Poly ethylene glycol s are fabricated via the polycondensation of ethylene glycol in the presence of acidic or basic catalysts, producing a lower molecular weight product.
In general, an environmentally friendly process with low carbon emissions and waste is. In 1941 modo started to produce ethylene oxide for further production of ethylene glycol. July 1, 2014 product uses1,4 ethylene is primarily used as a reactive monomer chemical building block make polyethylene and as an intermediate in the production of other organic compounds, such as ethylene dichloride and ethylene oxide. This column describes the production of monoethylene glycol from ethylene via a process similar to shells omega catalytic process. Ethylene glycol is used to manufacture antifreeze and deicing solutions for cars, airplanes, and boats. In 1963 modo started a production of ethylene oxide based on direct oxidation from ethylene in stenungsund, sweden. Ethylene glycol is a liquid inhalation ethylene glycol is a colorless liquid. Ethylene is oxidized with oxygen to form ethylene oxide in a. There, ethylene glycol meg, monoethylene glycol is produced from eo by reacting it with water at a 10 to 1 ratio of water to eo. The recovered ethylene glycol is recirculated in the scrubber system, and part of the spent ethylene glycol from the scrubber system is sent to storage in process tanks, after which it is sent to the ethylene glycol recovery system 14. It is produced industrially from ethylene or ethylene oxide. Pdf production of mono ethylene glycol by hydrolysis of. Selective catalytic twostep process for ethylene glycol.
The end uses for ethylene glycol are numerous see table 1. Ethylene is recovered from fcc off gas via ethylene recovery unit and oxygen from air through air separation unit. Due to its demand and a vast application area lot of research is going on for improving its production statistics. The ethylene and oxygen are added to a cycle gas which uses nitrogen or methane as the ballast. The reaction takes place in a tubular reactor which contains the silver catalyst. Meek, health canada, ottawa, canada published under the joint sponsorship of the united nations environment programme, the. In the standard thermal glycol reaction process, eo and water are reacted at an elevated temperature about 200c and pressure without catalyst. Ethylene glycol meg is a colorless liquid, utilized in the production of antifreeze, polyester fiber, pet bottle resins, polyester film, and a variety of other applications, including aircraft and runway deicing fluids. The specific eg and pg reaction steps utilized in this case study are described in appendix 5. It may also enter the environment from its uses in deicing airplane runways and from spills and improper disposal of used antifreeze, coolant, and solvents containing ethylene glycol. This compound is produced from the hydration of eo which may produce in addition to ethylene glycol diethylene glycols and triethylene glycols. Polyethylene glycol an overview sciencedirect topics. Process design for the production of ethylene from ethanol. Calculation of ethylene glycol production in a reactionrectification.
The largest local release to surface waters would follow ethylene glycol s use as a deicer on airport runways and planes. Poly ethylene glycol is not hydrolytically dissociated in vivo. Monoethylene glycol meg or ethylene glycol is the most important of the commercially available glycols. Ethylene glycol eg production and manufacturing process icis. The theory of the chemistry and the manufacturing process of the ethylene oxide process. In the described process, meg is produced via eo, which is manufactured in an integrated plant utilizing shell eo technology. A new process for the production of glycine by using antisolvent crystallization with the mixture of ethylene glycol meg and water as a substitute for methanol has been developed on the basis of. Since eo is very reactive and hazardous to handle and ship. A simulation model of a reactor for ethylene oxide production. It was produced on a small scale during world war i. Shell omega is the first process to enable ethylene glycol production via a fully catalytic process.