Pretreating agent for treating polymerization and crystallization of tower bottom liquid waste of CTEG rectifying tower

A technology for producing ethylene glycol from coal and a pretreatment agent, which is applied in the chemical industry, can solve the problems of inability to produce, easy to polymerize and crystallize, and cannot be treated with polymerization waste residues, and achieves the effect of low operating costs.

Inactive Publication Date: 2017-07-14
HENAN CHEM IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current treatment method is to carry out ordinary rectification to recover the ethylene glycol and diethylene glycol in the waste liquid, but there is a problem that is difficult to solve, that is, the coal-to-ethylene glycol waste liquid is very easy to polymerize during storage and transportation. And crystallization, causing the raw materials to start to aggregate and crystallize during the transportation process from the storage tank to the rectification tower and in the rectification tower, which seriously blocks the delivery pump, delivery pipeline and rectification equipment, and cannot carry out normal production
[0004] The solution to the existing device is to install a filter device before the rectification to filter the polymerized waste liquid, and then the filtrate enters the rectification system for rectification, but the conveying process before the filter is still severely blocked, and the energy consumption is high. Cause huge waste due to the polymerization of waste liquid and produce a large amount of polymerization waste that cannot be processed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of A pretreatment agent: Put 6g of dodecylbenzenesulfonic acid and 6g of 90% ethylene glycol solution into a container, stir and mix thoroughly to obtain the pretreatment agent.

[0015] B Pretreatment effect: Add 1000 grams of untreated waste liquid from the bottom of the coal-to-ethylene glycol rectification tower to a 2000ml beaker. It has been determined that the total content of ethylene glycol and diethylene glycol in the waste liquid is 82.66%, of which ethylene glycol Alcohol 40.23%, diethylene glycol 42.43%. Slowly add 12 grams of the pretreatment agent dropwise into the waste liquid at the bottom of the coal-to-ethylene glycol rectification tower under stirring and fully stir for ten minutes. The prepared sample remained unchanged for 480 hours, and the untreated sample began to aggregate from the surface after being placed for 10 minutes, and all aggregated into one within 2 hours. 1012 grams of the sample treated with the pretreatment agent was ...

Embodiment 2

[0017] A Preparation of pretreatment agent: Take 8.4g of hydroxyethylidene diphosphoric acid and 8.4g of 90% ethylene glycol solution into a container, stir and mix thoroughly to obtain the pretreatment agent.

[0018] B Pretreatment effect: Add 600 grams of untreated waste liquid from the bottom of the coal-to-ethylene glycol rectification tower to a 1000ml beaker. It has been determined that the total content of ethylene glycol and diethylene glycol in the waste liquid is 75.17%, of which ethylene glycol Alcohol 38.39%, diethylene glycol 36.78%. Slowly add 9 grams of the pretreatment agent dropwise to the waste liquid at the bottom of the coal-to-ethylene glycol rectification tower under stirring and fully stir for 30 minutes. The prepared sample remained unchanged for 1080 hours, and the untreated sample began to aggregate from the surface after being placed for 10 minutes, and all aggregated into one within 2 hours. 609 grams of the sample treated with the pretreatment ag...

Embodiment 3

[0020] A Preparation of pretreatment agent: Put 5.1g of dodecylsulfonic acid and 5.1g of 90% ethylene glycol solution into a container, stir and mix thoroughly to obtain the pretreatment agent. ,

[0021] B Pretreatment effect: Add 300 grams of untreated waste liquid from the bottom of the coal-to-ethylene glycol rectification tower to a 500ml beaker. It has been determined that the total content of ethylene glycol and diethylene glycol in the waste liquid is 80.51%, of which ethylene glycol Alcohol 39.85%, diethylene glycol 40.66%. Slowly add 3.5 grams of the pretreatment agent dropwise into the waste liquid at the bottom of the coal-to-ethylene glycol rectification tower under stirring and fully stir for 45 minutes. The prepared sample remained unchanged for 1500 hours, and the untreated sample began to aggregate from the surface after being placed for 10 minutes, and all aggregated into one within 2 hours. 303.5 grams of the sample treated with the pretreatment agent was ...

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PUM

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Abstract

The invention discloses a pretreating agent for treating polymerization and crystallization of a tower bottom liquid waste of a CTEG rectifying tower. The pretreating agent is prepared from dodecylbenzene sulfonic acid, dodecyl sulfonate, hydroxyethyl diphosphate and ethylene glycol at the mass ratio of (0-2) to (0-2) to (0-2) to (1-2). The pretreating agent is added to the liquid waste at the mass ratio of 0.1-1.8% to be fully mixed, and a stable CTEG liquid waste can be obtained for separation and recovery in the next step, so that polymerization blockage of a pipeline, a pump and the rectifying tower in the separation and recovery processes of the CTEG liquid waste is avoided, and the recovery system can continuously and stable run.

Description

technical field [0001] The invention relates to a pretreatment agent for solving the polymerization and crystallization of waste liquid at the bottom of a coal-to-ethylene glycol rectification tower, and belongs to the technical field of chemical industry. Background technique [0002] Coal-to-ethylene glycol is a device that produces ethylene glycol through gasification, coupling, hydrogenation, rectification and other processes using coal as raw material. It occupies an important position in my country's coal chemical industry. By the end of 2015, my country's coal-to-ethylene glycol The ethylene glycol plant has a production scale of 1.6 million tons. In Henan alone, there are three sets of 200,000-ton plants with an annual production capacity of 600,000 tons. In 2016, a new 1.66 million-ton coal-to-ethylene glycol plant will be built. By 2020, it is estimated that 41 sets of devices will be built, with a total production capacity of 10.26 million tons. [0003] In the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14B01D3/32B01D3/34B01D3/42
CPCB01D3/32B01D3/34B01D3/4283C02F5/14C02F2303/22
Inventor 成兰兴霍二福王伯楠师传兴郝凌云李迎春赵增兵程伟琴王毅楠冯明王延花谷中鸣李胜军侯占峰魏新军王留栓孟立山宁红军
Owner HENAN CHEM IND RES INST
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