Preparation process for producing epoxypropane by two-step extraction

A technology for the preparation of propylene oxide, which is applied in the field of preparation technology for the production of propylene oxide by the two-step extraction method, can solve the problems of low extraction rate, failure to achieve energy saving, increase in efficiency, and increased consumption of liquid caustic soda, and achieve reduction Pollution, low cost, and consumption reduction effects

Active Publication Date: 2013-04-17
山东昌邑海能化学有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, hydrochloric acid and monochloropropanol are extracted once with a complex extractant, and then saponified together, resulting in increased consumption of liquid caustic soda, low extraction rate, and the purpose of energy saving and efficiency enhancement has not been achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Two-step extraction method produces the preparation technology of propylene oxide, is characterized in that carrying out successively by following steps:

[0037] 1) Chloroalcoholization process: introduce chlorine gas, propylene, and industrial water into the bottom of the reactor, and a chloroalcoholization reaction occurs in the reactor to generate an aqueous solution of monochloropropanol;

[0038] 2) Monochloropropanol extraction process: the monochloropropanol aqueous solution is introduced into the upper part of the primary extraction tower through a pump, and the extractant trioctyl phosphate enters from the middle and lower part of the primary extraction tower, wherein the monochloropropanol aqueous solution and the extraction The volume ratio of the agent trioctyl phosphate is 1:1, and the monochloropropanol solution is extracted, and the extraction rate of the monochloropropanol aqueous solution is 99.2%, and the extraction agent trioctyl phosphate of the mono...

Embodiment 2

[0043]The extractant in the monochloropropanol extraction process in embodiment one is replaced by n-butyl acetate, the volume ratio of monochloropropanol aqueous solution and extractant n-butyl acetate is 1.5:1, the extraction of monochloropropanol aqueous solution The rate is 97.1%; In the hydrochloric acid complex extraction process, the aqueous phase (the mass concentration containing hydrochloric acid is 1.7%) after extracting monochloropropanol is introduced into the tower top of the secondary extraction tower by a pump, and the complex extraction agent (hexadecane Dimethyl tertiary amine: trimethyl phosphite: p-nitrophenethyl ether volume ratio is 45:40:15) enters from the middle and lower part of the secondary extraction tower for complex extraction, the water phase and the complex extraction agent The volume ratio is 2:1, and the extraction rate of hydrochloric acid is 97.5%. The rest of the process and equipment used are the same as those in Embodiment 1, and will no...

Embodiment 3

[0045] The extractant in the monochloropropanol extraction process in embodiment one is replaced by methyl isobutyl ketone, the volume ratio of monochloropropanol aqueous solution and extractant methyl isobutyl ketone is 3:1, monochloropropanol The extraction rate of the alcohol aqueous solution is 96.4%; in the hydrochloric acid complex extraction process, the aqueous phase (containing hydrochloric acid mass concentration is 1.8%) after extracting monochloropropanol is introduced into the tower top of the secondary extraction tower through the pump, and the complex extraction agent (dichloropropane: n-tridecane: toluene volume ratio is 60:30:10) enters from the middle and lower part of the secondary extraction tower for complex extraction, the volume ratio of the aqueous phase to the complex extraction agent is 3:1, The extraction rate of hydrochloric acid was 97.1%. The rest of the process and equipment used are the same as those in Embodiment 1, and will not be described ag...

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Abstract

The invention discloses a preparation process for producing epoxypropane by two-step extraction, belonging to the technical field of the production of fine chemical intermediates. The preparation process is characterized by comprising the following steps of: adding an extraction agent into aqueous mono-chloropropanol solution, and then extracting out mono-chloropropanol and discharging a water phase from the bottom of a first-stage extraction tower; adding the water phase from which the mono-chloropropanol is extracted into a complexing extraction agent to discharge hydrochloric acid, and discharging the water phase from the bottom of a second-stage extraction tower; pumping the extraction agent of the extracted mono-chloropropanol into a rectification tower, and separating out the mono-chloropropanol and the extraction agent; and pumping the separated mono-chloropropanol into a saponification reactor to perform saponification reaction with sodium hydroxide solution to generate crude epoxypropane, and rectifying the crude epoxypropane to obtain the epoxypropane product. According to the preparation process disclosed by the invention, the aqueous mono-chloropropanol solution is extracted to separate the hydrochloric acid from the aqueous mono-chloropropanol solution after the aqueous mono-chloropropanol solution is prepared by a traditional method, so that the consumption of the sodium hydroxide solution in the saponification process can be reduced, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of production of fine chemical intermediates, and in particular relates to a preparation process for producing propylene oxide by a two-step extraction method. Background technique [0002] At present, there are two main production processes of propylene oxide: chloroalcoholization and co-oxidation. The traditional chloroalcoholization process for producing propylene oxide mainly uses chlorine gas, water and propylene to undergo chloroalcoholization to generate the intermediate monochloropropanol, which is then saponified with milk of lime. The concentration of monochloropropanol produced by this method is often too high or too low, which is difficult to control. If the concentration of monochloropropanol solution is too high, the side reaction will increase and the selectivity will decrease, which is not conducive to the balance of chemical reactions and will seriously corrode the equipment; The larger th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/26C07C31/36C07C29/86C01F11/28
Inventor 蒲伟于强强裴迎迎刘俊栋艾蒙王金富高唤第
Owner 山东昌邑海能化学有限责任公司
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