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Gas drying system and drying method in a synthesis gas-to-ethylene glycol process

A technology of gas drying and ethylene glycol, applied in the field of gas drying system and drying, gas drying system, can solve the problem of harmful gas emission, reduce pollution, reduce nitrogen consumption, and facilitate production and operation

Active Publication Date: 2016-01-20
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a gas drying system used in the synthesis gas to ethylene glycol process to solve the problem of discharging harmful gases into the atmosphere during the purging and replacement process during regeneration of the adsorption tank

Method used

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  • Gas drying system and drying method in a synthesis gas-to-ethylene glycol process
  • Gas drying system and drying method in a synthesis gas-to-ethylene glycol process
  • Gas drying system and drying method in a synthesis gas-to-ethylene glycol process

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Embodiment 1

[0040] Such as figure 2 As shown, a gas drying system in the synthesis gas to ethylene glycol process includes an oxidation esterification tower 1, a condenser 2, a drying device and a cooler 5 connected in sequence through pipelines, and the bottom of the drying device is connected in sequence There is a heater 6 and a circulator 7, the upper part of the cooler 5 has a gas outlet, which is connected to the circulator 7, and the drying device is connected to the carbonylation reaction unit;

[0041] Wherein, the pipeline between the drying device and the cooler 5 is connected with a storage tank 8, which is filled with lye. The lye is 10% lye prepared with methanol.

[0042] The storage tank 8 is also connected with the esterification reaction unit.

[0043] The drying device is two adsorption tanks that alternately perform adsorption and regeneration work, namely the first adsorption tank 3 and the second adsorption tank 4 .

Embodiment 2

[0045] A method for gas drying using the gas drying system in the described synthetic gas to ethylene glycol process, such as image 3 As shown (the direction indicated by the solid arrow is the movement direction of the reaction gas, and the direction indicated by the dotted arrow is the movement direction of the circulating nitrogen gas), including the following steps:

[0046] 1) The first adsorption tank 3 performs adsorption work, and the second adsorption tank 4 is a regeneration tank;

[0047] The reactant gas coming out from the oxidation esterification tower 1 enters the first adsorption tank 3 after being cooled, and the molecular sieve in the first adsorption tank 3 absorbs trace water therein and sends it to the carbonylation unit, and the first adsorption tank 3 is prepared carry out regeneration work;

[0048] While the first adsorption tank 3 is performing adsorption work, the second adsorption tank 4 is performing a regeneration process: firstly, pure nitrogen...

Embodiment 3

[0052] A method for gas drying using the gas drying system in the described synthetic gas to ethylene glycol process, such as Figure 4 As shown (the direction indicated by the solid arrow is the movement direction of the reaction gas, and the direction indicated by the dotted arrow is the movement direction of the circulating nitrogen gas), including the following steps:

[0053] 1) The second adsorption tank 4 performs adsorption work, and the first adsorption tank 3 is a regeneration tank;

[0054] The reaction gas coming out from the oxidation esterification tower 1 enters the second adsorption tank 4 after being cooled, and the molecular sieve in the second adsorption tank 4 absorbs trace water therein and sends it to the carbonylation unit, and the second adsorption tank 4 is prepared carry out regeneration work;

[0055] While the second adsorption tank 4 is performing adsorption work, the first adsorption tank 3 is performing a regeneration process: firstly, pure nitr...

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PUM

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Abstract

The invention discloses a gas drying system in the technology of preparing ethylene glycol from synthesis gas. The system comprises an oxidation and esterification tower (1), a condenser (2), a drying device and a cooler (5) all connected in sequence through pipelines, wherein the bottom of the drying device is connected with a heater (6) and a circulator (7) in sequence; a gas outlet is formed in the upper part of the cooler (5) connected with the circulator (7); the drying device is connected with a carbonylation reaction unit; a storage tank is connected onto a pipeline between the drying device and the cooler (5), and is internally filled with alkali liquor. According to the invention, poisonous gas is not emptied to the atmosphere in the blowing and replacing during the regenerative process of the device, so that the emission of harmful gas is avoided, and the environment is protected; besides, the nitrogen consumption is reduced, and the production is reduced; in addition, the control process of the whole technology is comparatively stable, and the production operation of chemical industry personnel is convenient.

Description

technical field [0001] The invention relates to a gas drying system and a drying method, in particular to a gas drying system used in the synthesis gas-to-ethylene glycol process and a gas drying method using the system. Background technique [0002] The esterification unit in the synthesis gas to ethylene glycol production mainly uses the NO cycle gas, oxygen and methanol returned from the carbonylation unit as raw materials. Methyl nitrate (MN) and water, the reaction equation is: [0003] N 2 o 3 +2CH 3 OH→2CH 3 ONO+H 2 o [0004] After cooling the gas from the top outlet of the oxidative esterification tower to 5°C, the gas is further dried to remove a small amount of water (because a small amount of water will deactivate the carbonylation reaction catalyst), and finally sent to the downstream carbonylation unit. [0005] Existing problems: such as figure 1 Shown is a gas drying system in the prior art, such as figure 1 As shown, it includes an oxidation esteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/26B01D53/02C07C203/00C07C201/04
Inventor 李红段巍周军
Owner PUJING CHEM IND SHA