Process for producing epoxypropane by adopting caustic soda saponification method

A technology for producing propylene oxide and a production process, which is applied in the field of producing propylene oxide with caustic soda as a saponification agent, can solve problems such as pollution, and achieve the effects of zero emission and reduced refining costs

Active Publication Date: 2013-03-06
SHANDONG HAIHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses a clean production process for producing propylene oxide by caustic soda saponification, which combines the production of propylene oxide by caustic soda saponification and the production of soda ash by ammonia soda, and comprehensively utilizes saponification wastewater water resources and salt resources with low energy consumption , to solve the problem of environmental pollution of waste water and waste residue, and at the same time reduce the cost of brine refining in the production of soda ash by ammonia-soda method

Method used

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  • Process for producing epoxypropane by adopting caustic soda saponification method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Dissolve chlorine gas in process water preheated to 35°C to generate a hypochlorous acid solution, then pass excess propylene into the hypochlorous acid solution for chloroalcoholization reaction, the molar ratio of chlorine gas to propylene is 1:1.05, and generate chlorine-containing Propanol is a solution of 3.5wt% and equimolar hydrochloric acid, the reaction pressure is normal pressure, and the reaction temperature is 55°C;

[0019] (2) Mix the solution containing 3.5wt% chloropropanol and 11wt% caustic soda solution according to the molar ratio of sodium hydroxide / chloropropanol+hydrochloric acid at 1.1:1, saponification reaction occurs in the saponification tower, and quickly stripped to obtain The crude propylene oxide of 90wt%, saponification reaction temperature is controlled at 90 ℃, and saponification tower top pressure is 35Kpa absolute pressure;

[0020] (3) Send the crude propylene oxide with a content of 90wt% into the propylene oxide front distillati...

Embodiment 2

[0023] (1) Dissolve chlorine gas in process water preheated to 40°C to generate a hypochlorous acid solution, then pass excess propylene into the hypochlorous acid solution for chloroalcoholization reaction, the molar ratio of chlorine gas to propylene is 1:1.1, and generate chlorine-containing Propanol is 3.7wt% chloropropanol solution, the reaction pressure is slightly higher than normal pressure, and the reaction temperature is 68°C;

[0024] (2) Mix chloropropanol solution containing 3.7wt% chloropropanol with 12wt% caustic soda solution according to the sodium hydroxide / chloropropanol+hydrochloric acid molar ratio of 1.15: 1, saponification reaction occurs in the saponification tower, and rapidly The crude propylene oxide of 95wt% is obtained by stripping, the saponification reaction temperature is controlled at 100°C, and the pressure at the top of the saponification tower is 40Kpa absolute pressure;

[0025] (3) Send the crude propylene oxide with a content of 95wt% int...

Embodiment 3

[0028] (1) Dissolve chlorine gas in process water preheated to 45°C to generate a hypochlorous acid solution, then pass excess propylene into the hypochlorous acid solution for chloroalcoholization reaction, the molar ratio of chlorine gas to propylene is 1:1.1, and generate chlorine-containing Propanol is 4wt% chloropropanol solution, the reaction pressure is normal pressure, and the reaction temperature is 65°C;

[0029] (2) The molar ratio of chloropropanol solution containing 4wt% chloropropanol to 13wt% caustic soda solution sodium hydroxide / chloropropanol+hydrochloric acid is 1.2:1, saponification reaction occurs in the saponification tower, and quickly stripped to obtain The crude propylene oxide of 95wt%, saponification reaction temperature is controlled at 100 ℃, and saponification tower top pressure is 40Kpa absolute pressure;

[0030](3) Send the crude propylene oxide with a content of 95wt% into the propylene oxide front distillation tower and rectification tower. ...

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Abstract

The invention discloses a process for producing epoxypropane by adopting a caustic soda saponification method. Caustic soda is used as a saponification agent in the production of epoxypropane. Epoxypropane is produced through chlorohydrination, caustic soda saponification and rectification; and after being treated, saponification wastewater generated in the production process is used as salt-melting water in the production of sodium carbonate by adopting an ammonia-soda process; therefore, water resources and salt resources in the saponification wastewater can be comprehensively utilized, and brine purification cost in the process of producing sodium carbonate by adopting the ammonia-soda process can be lowered, no waste residue is generated in the whole process, and zero emission of wastewater is realized. The process is an environment-friendly cleaner production process.

Description

technical field [0001] The invention relates to a production process for preparing propylene oxide by using propylene and chlorine gas as raw materials, in particular to a production process for preparing propylene oxide by using propylene and chlorine gas as raw materials and caustic soda as a saponification agent. Background technique [0002] The traditional production method of propylene oxide by the chlorohydrin method uses calcium hydroxide as a saponification agent, which produces a large amount of waste residue and waste liquid, which seriously pollutes the environment. The National Development and Reform Commission's "Industrial Structure Adjustment Guidance Catalog (2011)" has included this This production method is included in the "restricted category"; Chinese patent 200710011073.0 discloses a production method for producing propylene oxide using electrolyte as a saponification agent. , to generate chloropropanol, and then use the electrolyte as a saponification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/26C07D303/04C07C19/01C07C17/02C07C43/12C07C41/16C01D7/18
Inventor 迟庆峰何加海殷良诚吴中平朱荣振蔡巍张少飞张明昌雷宁董国良赵守军陈砚祥
Owner SHANDONG HAIHUA GRP CO LTD
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