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Method for production of ethylene oxide

Inactive Publication Date: 2002-01-24
RECOVERYCARE COM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0018] (F) a step of extracting portion of the absorption solution obtained through the bottom of the ethylene oxide stripper, introducing it to the by-produced ethylene glycol concentration column and heating the bottoms of the concentration column thereby effecting dehydration and concentration,
[0022] It has been demonstrated that by partly removing the steam generated in the top portion of the multi-effect evaporator and utilizing the removed steam as the source for heating the other steps, it is made possible to recover the thermal energy possessed by the steam, attain effective utilization of energy and, with a smaller consumption of the energy than the total amount of energy used at the other steps and in the other multi-effect evaporator, fulfill the distillation at the other steps and the evaporation and concentration in the multi-effect evaporator.

Problems solved by technology

Since these operations consume large amount of heat, they are under obligation to control supply of the heat volumes efficiently.

Method used

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  • Method for production of ethylene oxide

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Embodiment Construction

[0024] Now, this invention will be specifically explained below with reference to preferred mode of embodying this invention below.

[0025] The reaction of ethylene oxide with water is carried out under the following conditions. A molar ratio of ethylene oxide and water, namely ethylene oxide:water, is in the range of 1:7-1:50, preferably 1:5-1:30. A reaction pressure is in the range of 0.5-3.0 MPa (Gauge), preferably 1.5-2.5 MPa (Gauge), a reaction temperature is in the range of 120.degree.-250.degree. C., preferably 130.degree.-180.degree. C., and a concentration of the formed ethylene glycol was in the range of 5-40 mass %. The reaction is carried out in the batch-wise, the semibatch-wise, or the continuously, which ever fits the occasion best. The ethylene glycol thus obtained is supplied to the multi-effect evaporator and concentrated and dehydrated till a concentration of 40-95 mass % or over.

[0026] The number of multi-effect evaporators is described in detail at pages 428-431 o...

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Abstract

In a composite process for subjecting ethylene to catalytic gas phase oxidation thereby obtaining ethylene oxide and causing this ethylene oxide to react with water thereby obtaining ethylene glycol, a method for producing the ethylene glycol is provided which permits effective utilization of the energy at the step for dehydrating and concentrating the resultant aqueous ethylene glycol solution. In the production of ethylene glycol by the supply of the aqueous ethylene glycol solution to a concentrating treatment at the multi-effect evaporator, the method contemplated by this invention for the production of ethylene glycol comprises utilizing as the source of heating at least one specific step the steam generated in the multi-effect evaporator.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a method for the production of ethylene glycol. Particularly this invention pertains, in a composite process for obtaining ethylene oxide by catalytic gas phase oxidation of ethylene and causing the ethylene oxide to react with water thereby obtaining ethylene glycol, to a method for the production of ethylene glycol by advantageously utilizing in the composite process mentioned above the vapor generated in the multi-effect evaporator used in the step for concentrating the produced aqueous ethylene glycol solution.[0003] 2. Description of the Related Art[0004] Ethylene glycol is usually produced by the reaction of ethylene oxide with water. Then, the ethylene oxide is produced nowaday by the catalytic gas phase oxidation of ethylene with a molecular oxygen-containing gas in the presence of a silver catalyst. The process for the production of ethylene oxide is roughly as follows.[0005] The reaction gas containing ethyle...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J23/50C07B61/00C07C29/10C07C31/20C07C41/03C07C43/10C07C43/11C07D301/10
CPCC07C29/106C07D301/10C07C31/202Y02P20/52
Inventor KAKIMOTO, YUKIHIKOOKA, YOSHIHISA
Owner RECOVERYCARE COM
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