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Method for producing glycol by epoxy ethane hydration

A technology of ethylene oxide water and ethylene oxide, which is applied in the field of ethylene oxide hydration to ethylene glycol, can solve the problems of large equipment investment, long process flow, high water ratio of non-catalytic hydration reaction, and reduce production. cost, the effect of simplifying the process

Active Publication Date: 2005-10-19
SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the high water ratio of non-catalytic hydration reaction in the above-mentioned literature, long process flow, high energy consumption, or the reactor of the catalytic hydration process is huge, the equipment investment is large, and the requirements for catalyst stability are high. , resulting in high production costs, a method for producing ethylene glycol is provided, which simplifies the existing process flow, greatly reduces the ratio of feed to water and the unit consumption of ethylene oxide, and at the same time reduces the side effects from the engineering aspect. Possibility of the reaction to improve the selectivity of ethylene glycol, with the characteristics of low production cost and high selectivity of ethylene glycol

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] In the reactive distillation tower with an inner diameter of 24 mm, 10 trays in the reactive distillation section and 6 trays in the stripping section are set. Water is fed from the upper part of the tower at a flow rate of 21.6 g / h, while ethylene oxide has only one feed port, and feeds from the eleventh tray (counting from top to bottom) at a flow rate of 17.6 g / h. Feed the material in a molar ratio and the water ratio is 3:1. Ethylene oxide and water react in the reactive distillation section. The reaction temperature is 184°C. The operating pressure of the tower is 1.1MPa in absolute pressure. The product stream (including monoethylene glycol, diethylene glycol and a small amount) (Polyethylene glycol) through the liquid phase enters the next layer of trays, and enters the stripping section, where the product is concentrated by the stripping section, and the product is discharged from the bottom of the tower. The total mass of the feed is equal to the total mass of the ...

Embodiment 2

[0031] In the reactive distillation tower with an inner diameter of 24 mm, 15 trays in the reactive distillation section and 6 trays in the stripping section are set. Water is fed from the top of the tower at a flow rate of 18.0 g / h. There are three feed ports for ethylene oxide. The total flow rate is 17.6 g / h and divided into three streams of the same flow rate from the 9th, 12th, and 15th plates (from the top). From the next few), the feed was fed separately, and the feed was in a molar ratio, and the water ratio was 2.5:1. Ethylene oxide and water react in the reactive distillation section. The reaction temperature is 184°C. The operating pressure of the control tower is 1.1MPa in absolute pressure. The product stream (including monoethylene glycol, diethylene glycol and A small amount of polyglycol) enters the next layer of trays through the liquid phase and enters the stripping section, where the product is concentrated by the stripping section, and the product is discharged...

Embodiment 3

[0036] According to the kinetic data obtained in Examples 1 and 2, the internal diameter of the reactive distillation column is 4400 mm, the reactive distillation section has 20 trays, and the stripping section has 8 trays to simulate the production scale. Water is fed from the top of the tower at a flow rate of 390.3 kmol / h, and ethylene oxide has only one feed port, and it is fed from the twentieth tray (counting from top to bottom) at a flow rate of 139.4 kmol / h. The feed is measured in molar ratio, and the water ratio is 2.8:1. The operating pressure of the control tower is 1.2MPa in absolute pressure, the temperature of the tower bottom is 207.7°C, and the typical temperature of the reactive distillation section is 188°C. The discharge at the top of the tower is condensed into a single liquid phase with cooling water, and all flows back into the tower, and only the discharge at the bottom of the tower.

[0037] Water

Ethylene oxide (EO)

Ethylene glycol (MEG) ...

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Abstract

The present invention relates to epoxy ethane hydrating process to produce glycol. Unlike available technology, which needs several towers or several reactors and several reaction steps, the process of the present invention has the epoxy ethane hydrating reaction and the separation of glycol completed simultaneously in the reacting and rectifying tower, and thus has greatly simplified technological process, greatly lowered material / water ratio and epoxy ethane consumption, less side reactions and obviously raised glycol selectivity. The present invention has the features of low production cost and high glycol selectivity, and may be used in industrial production.

Description

Technical field [0001] The invention relates to a method for preparing ethylene glycol by hydration of ethylene oxide, in particular to a method for preparing ethylene glycol by hydration of ethylene oxide in a reactive distillation tower. Background technique [0002] Ethylene glycol is mainly used in the production of polyester resins, including fibers, films and engineering plastics. It can be directly used as coolant and antifreeze. It is also used to produce alkyd resins, plasticizers, paints, adhesives, surfactants, and explosives. It is a very important aliphatic diol, an essential substance for products such as capacitor electrolyte. [0003] Using ethylene oxide as a raw material to prepare ethylene glycol, there are two main process routes: one is direct hydration, where ethylene oxide reacts with water under certain conditions to produce ethylene glycol, which is divided into catalytic hydration and non-catalytic hydration Two processes; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07C31/20
Inventor 何文军李应成费泰康王嘉华陈永福
Owner SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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