Method for preparing calcium chloride from high-alkalinity calcium solution and extracted hydrochloric acid in epoxypropane production

A technology of propylene oxide and high alkalinity, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problem of low yield of propylene oxide, low utilization rate of hydrochloric acid, large heat consumption, etc. problems, to achieve the effect of environmental protection, high concentration and improved yield

Active Publication Date: 2013-04-24
山东昌邑海能化学有限责任公司
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  • Application Information

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Problems solved by technology

[0006] Above method all is to carry out saponification together with hydrochloric acid and chloropropanol, after saponification finishes, the calcium chloride that generates is concentrated or further processed, not only needs to consume a large amount of alkali in saponification process, and, the productive rate of propylene oxide is lower Low, the utilization rate of hydrochloric acid is also low
In the process of evaporating the calcium chloride solution, a large amount of heat energy will be consumed

Method used

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  • Method for preparing calcium chloride from high-alkalinity calcium solution and extracted hydrochloric acid in epoxypropane production

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Embodiment 1

[0033] A method for preparing calcium chloride from a high alkalinity calcium solution and extracted hydrochloric acid in the production of propylene oxide, comprising the following process steps:

[0034] 1) Chloroalcoholization reaction: react chlorine gas, propylene and water, the content of chloropropanol produced is about 4%, and the content of hydrochloric acid is about 1.6%;

[0035] 2) Extraction of chloropropanol: After extracting the chloropropanol obtained in step 1) with an extractant, enter the saponification process to produce propylene oxide;

[0036] 3) Extraction of hydrochloric acid: fully extract the hydrochloric acid in the solution after extracting chloropropanol in step 2) with a complex extractant, which is composed of n-trioctylamine, n-tetradecane and tributyl phosphate It is mixed at a volume ratio of 50:45:5, and the extraction temperature is 80°C. The so-called full extraction means that the extracted hydrochloric acid is saturated, and the extracti...

Embodiment 2

[0043] The difference with embodiment 1 is:

[0044] 1) The blending agent in the complexing extractant is n-octanol instead of tributyl phosphate in Example 1, and the volume ratio of solvent, complexing agent and blending agent is 70:25:5;

[0045] 2) In step 4), lime is used instead of slaked lime, ammonium chloride solution with a concentration of about 3mol / L is selected, and the alkalinity of the prepared high-alkalinity calcium solution is 2.25mol / L, and the preparation temperature is 80°C.

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Abstract

The invention discloses a method for preparing calcium chloride from a high-alkalinity calcium solution and extracted hydrochloric acid in epoxypropane production, belonging to the technical field of fine chemical engineering. The method comprises the following steps: 1) extracting chloropropanol produced by a chlorohydrination process with an extractant, and extracting hydrochloric acid in the chlorohydrination production process with a complexing extractant; 2) preparing an ammonium chloride solution and lime or white lime into a high-alkalinity calcium solution with the alkalinity of 2-5 mol / L; 3) adding the extracted hydrochloric acid into the high-alkalinity calcium solution; and 4) separating the water phase from the oil phase, cooling the water phase, and finally, concentrating to obtain the calcium chloride solid. In the method, the hydrochloric acid is extracted with the specific extractant and reacts with the high-alkalinity calcium solution to obtain the calcium chloride; and since the hydrochloric acid does not participate into the saponification reaction, thereby saving the consumption of the saponifier and preparing the calcium chloride at lower cost.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for preparing calcium chloride from a high-basic calcium solution and extracting hydrochloric acid in the production of propylene oxide. Background technique [0002] Propylene oxide, also known as propylene oxide and methyl oxirane, is a very important organic compound raw material and the third largest propylene derivative after polypropylene and acrylonitrile. At present, the relatively mature production methods at home and abroad are only chloroalcoholation and hydroperoxidation. Among them, chloroalcoholation is widely used by manufacturers because of its simple process and low operating cost. However, this method will produce a large amount of Not only the utilization rate of raw materials is low, but also the large amount of waste water produced will pollute the environment. [0003] Chlorohydrin method propylene oxide saponification wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28
Inventor 蒲伟于强强刘俊栋李连杰田维俊高翠单
Owner 山东昌邑海能化学有限责任公司
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