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Dewatering method for glycol production process

A production process, ethylene glycol technology, applied in the chemical industry, can solve the problems affecting the production cost of ethylene glycol, long production process, energy and water consumption, etc., and achieve the effect of long service life, short process and high dehydration depth

Active Publication Date: 2014-09-10
ALLY HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the production process is long, the equipment is large, and the energy consumption is high, which directly affects the production cost of ethylene glycol; Hydrolysis, dehydration and rectification of alkanes to prepare
The biggest disadvantage of this method is that a large amount of energy is required to evaporate about 85% of the water in the product during production, which will cause a large amount of energy and water consumption

Method used

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  • Dewatering method for glycol production process
  • Dewatering method for glycol production process
  • Dewatering method for glycol production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A kind of dehydration method in the ethylene glycol production process, the working process of its adsorption tower A and adsorption tower B comprises the following steps:

[0050] a', the raw material ethylene glycol solution is vaporized by the vaporization superheater, and after being heated by the heater, the valve V102 is opened to allow the ethylene glycol vapor to pass through the adsorption tower B from top to bottom through the valve KC05, and the room temperature and adsorption pressure in the adsorption tower B Under the condition of 0.1Mpa, the adsorption is carried out on the molecular sieve bed for 3-10 minutes; the gas after adsorption is condensed through the one-way valve V108 and the condenser, and then discharged, and the gas after the adsorption can get 99.5% ( For ethylene glycol above V / V%), after the adsorption is completed, close the valve KC05, stop feeding the raw material gas, and heat and vaporize at a temperature of 150-170°C.

[0051] ...

Embodiment 2

[0064] A kind of dehydration method in the ethylene glycol production process, the working process of its adsorption tower A and adsorption tower B comprises the following steps:

[0065] The raw material ethylene glycol solution is vaporized by the vaporization superheater, and after being heated by the heater, the valve V102 is opened, so that the ethylene glycol vapor passes through the valve KC05 and passes through the adsorption tower B from top to bottom. The normal temperature and adsorption pressure in the adsorption tower B are 0.1Mpa Adsorption is carried out on the molecular sieve bed for 8 minutes under certain conditions; the adsorbed gas is condensed through the one-way valve V108 and the condenser, and then discharged, and the adsorbed gas can obtain 99.5% (V / V%) after passing through the condenser After the above ethylene glycol is adsorbed, close the valve KC05 and stop feeding the raw material gas.

[0066] a. Adsorption: The raw material ethylene glyco...

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Abstract

The invention relates to a dehydration method in the production process of ethylene glycol. The dehydration method includes the process steps of adsorption tower A and adsorption tower B, wherein the working step of adsorption tower A is a adsorption: enter the ethylene glycol vapor into the adsorption tower A for adsorption, condense and collect ethylene glycol, and stop after the adsorption is completed Feed in the raw material gas; b reverse depressurization: open the valve for reverse depressurization, desorb the impurity components and then vent; c heat up: heat the regenerated gas after the adsorption is completed, and then go to the adsorption tower A again to regenerate the adsorbent , d cooling step and e step-up step, etc. The operation steps of adsorption tower B are the same as those of adsorption tower A, but they are staggered in time. The method is a trouble-free operation, and the annual working time can reach more than 300 days; the dehydration method has a short process, low investment, and a high yield of ethylene glycol; it has a long service life, and the replacement time of the adsorbent under normal operating conditions is generally 15-20 years.

Description

technical field [0001] The invention relates to a dehydration method in the field of chemical industry, in particular to a dehydration method in the production process of ethylene glycol. Background technique [0002] Ethylene Glycol (EG or MEG), commonly known as glycol, is the simplest aliphatic diol and an important organic chemical raw material. It can be used as raw material for the production of antifreeze, lubricant, plasticizer, surfactant, etc. Therefore, ethylene glycol is a basic organic chemical raw material with a wide range of uses. [0003] At present, the main method of industrial production of ethylene glycol at home and abroad is direct hydration of ethylene oxide. Using ethylene and oxygen as raw materials, in the presence of silver catalysts, methane or nitrogen stabilizers, and chloride inhibitors, ethylene is directly oxidized to ethylene oxide, and hydration reaction is carried out in a tubular reactor to generate ethylene glycol. The alcohol solut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/76
Inventor 沈静王业勤杜雯雯
Owner ALLY HI TECH CO LTD
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