An energy-saving process for separating diethylamine-acetone wastewater by stripping-extractive distillation

A technology of extractive distillation and extractive distillation column, which is applied in the field of energy-saving technology for the separation of diethylamine-acetone wastewater by stripping-extractive distillation, and can solve the difficulty, reaction and process that cannot be separated by ordinary distillation and increase separation. Complicated problems, to achieve the effect of good chemical thermal stability, saving equipment investment, and improving relative volatility

Active Publication Date: 2020-06-23
青岛三瑞节能环保技术有限公司
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Problems solved by technology

[0003] In diethylamine-acetone wastewater, there are mainly three components: diethylamine, acetone and water. The boiling point of diethylamine is 55.5°C, and the boiling point of acetone is 56.1°C. The difference between the boiling points of the two is only 0.6°C, and Diethylamine-acetone forms an azeotrope at normal pressure, which increases the difficulty of separation, so it cannot be separated by ordinary rectification
[0004] Chinese patent CN105753677A discloses a method for recovering acetone and diethylamine in the mother liquor after the ammonification of propatamol hydrochloride. The purity of the acetone product obtained by the method is 99.0%, and the purity of the diethylamine product is 98.5%. However, the method involves The reaction is complex and the process is difficult to operate

Method used

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  • An energy-saving process for separating diethylamine-acetone wastewater by stripping-extractive distillation

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Effect test

Embodiment 1

[0031] The feed temperature is 20° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 10% (mass fraction) of diethylamine, 20% (mass fraction) of acetone, and 70% (mass fraction) of water. The number of theoretical plates of the stripper is 20, the feed position of diethylamine-acetone wastewater is the 13th block, the theoretical plate number of the extractive distillation column is 25, and the feed position is the 15th block, the flow rate of the extraction agent ethylene glycol It is 600kg / h (solvent ratio is 0.6), the feeding position of the extractant is the third block; the number of theoretical plates of the extraction agent recovery tower is 15, and the feeding position is the eighth block. The purity of diethylamine after separation is 99.10% (mass fraction), the purity of acetone is 99.10% (mass fraction), the purity of water is 99.98% (mass fraction), utilize jet pump to save about 150kg / h of steam.

Embodiment 2

[0033] The feed temperature is 20° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 30% (mass fraction) of diethylamine, 30% (mass fraction) of acetone, and 40% (mass fraction) of water. The theoretical plate number of the stripper is 35, the feed position of diethylamine-acetone wastewater is the 25th block, the theoretical plate number of the extractive distillation column is 50, and the feed position is the 30th block, the flow rate of the extraction agent ethylene glycol It is 3000kg / h (solvent ratio is 3), the feeding position of the extractant is the 10th block; the number of theoretical plates of the extraction agent recovery tower is 40, and the feeding position is the 25th block. The purity of diethylamine after separation is 99.30% (mass fraction), the purity of acetone is 99.30% (mass fraction), and the purity of water is 99.99% (mass fraction), utilize jet pump to save about 200kg / h of steam.

Embodiment 3

[0035]The feed temperature is 20° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 50% (mass fraction) of diethylamine, 20% (mass fraction) of acetone, and 30% (mass fraction) of water. The number of theoretical plates of the stripper is 25, the feed position of diethylamine-acetone wastewater is the 14th block, the theoretical plate number of the extractive distillation column is 30, and the feed position is the 15th block, the flow rate of the extraction agent ethylene glycol It is 1200kg / h (solvent ratio is 1.2), the feeding position of the extractant is the fifth block; the number of theoretical plates of the extraction agent recovery tower is 20, and the feeding position is the eleventh block. The purity of diethylamine after separation is 99.15% (mass fraction), the purity of acetone is 99.13% (mass fraction), the purity of water is 99.98% (mass fraction), utilize jet pump to save about 130kg / h of steam.

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Abstract

The invention relates to an energy-saving technology for separation of diethylamine-acetone wastewater by steam stripping-extractive distillation. The technology combines steam stripping and extractive distillation, firstly diethylamine and acetone in wastewater are separated by a stripping tower, the separated water can be discharged directly, the diethylamine and acetone mixture separated from the stripping tower enters an extractive distillation tower, ethylene glycol is used as the extractant, and extractive distillation is utilized for separation, diethylamine is recovered from the top of the extractive distillation tower, the extractant and acetone mixture enters an extractant recovery tower from the bottom of the extractive distillation tower, after effective separation, acetone is recovered from the top of the extractant recovery tower, and the extractant is recovered from the bottom of the extractant recovery tower for recycling. The technology utilizes an injection pump and a flash tank to recover a part of steam, and also utilizes the extractant circulating material flow to preheat the feed material flow, thus achieving the purpose of energy saving. According to the invention, the process is simple, the separated products have high purity, and the adopted extractant is easily recoverable and has good chemical thermal stability.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in chemical and pharmaceutical industries, and in particular relates to an energy-saving process for separating diethylamine-acetone wastewater by steam stripping-extractive distillation. 【Background technique】 [0002] Acetone is mainly used as a solvent in industries such as explosives, plastics, rubber, fiber, leather, grease, spray paint, etc. It can also be used as a solvent for the synthesis of enone, acetic anhydride, iodoform, polyisoprene rubber, methacrylic acid, etc. An important raw material for methyl ester, chloroform, epoxy resin and other substances. Diethylamine is used as a solvent and an intermediate of many chemical raw materials in the industry. It can be used to prepare drugs such as procaine, chloroquine, nicothamide, coramine and sulfonamide. It can also be used to produce pesticides, dyes, and rubber. Vulcanization accelerators, beneficiation agents, textile a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/78C07C45/83C07C49/08C07C209/86C07C211/05
CPCC07C45/78C07C45/83C07C209/86C07C49/08C07C211/05Y02P20/10
Inventor 王英龙赵永滕朱峰刘兴振
Owner 青岛三瑞节能环保技术有限公司
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