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Technology for jointly producing ammonium sulfate and chloromethane

A monochloromethane and combined production technology, applied in the field of chemical technology, can solve the problems of reducing the purity of hydrogen chloride gas, etc., and achieve the effect of being suitable for large-scale production, increasing energy consumption, and continuous feeding

Active Publication Date: 2013-07-10
BEIJING EDGEIN TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in the prior art, air is also introduced when the hydrogen chloride gas is exported under negative pressure or normal pressure conditions, thereby reducing the purity of the prepared hydrogen chloride gas

Method used

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  • Technology for jointly producing ammonium sulfate and chloromethane

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Effect test

Embodiment 1

[0045] The present embodiment provides a kind of technology of joint production ammonium sulfate and monochloromethane, as attached figure 1 As shown, specifically:

[0046] S1, the concentrated sulfuric acid of the 98wt% of 5349 grams of ammonium chloride and 11000 grams is added in the premixing pool of belt stirring and strainer and carry out normal pressure premixing, the ratio of the amount of substance of ammonium chloride and sulfuric acid is 1:1.1, pre-mixed The mixing temperature is 15°C.

[0047] S2. The premixed ammonium chloride sulfuric acid solution is continuously sent into the tubular reactor with a steam jacket by a small pump, and a metathesis reaction occurs to generate ammonium bisulfate and hydrogen chloride. This reaction is an endothermic reaction, and the required heat is obtained by The steam jacket of the tubular reactor is provided, the reaction temperature is 110°C, and the pressure is 0.2MPa. The obtained ammonium bisulfate solution is evaporated ...

Embodiment 2

[0058] The present embodiment provides a kind of technique of jointly producing ammonium sulfate and monochloromethane, with embodiment 1, specifically:

[0059] S1. Add 5349 grams of ammonium chloride and 24500 g of 60wt% sulfuric acid into the premixing tank with stirring and filter screen for normal pressure premixing, the ratio of the amount of ammonium chloride and sulfuric acid is 1:1.5, premixing The temperature is 30°C.

[0060]S2. The premixed ammonium chloride sulfuric acid solution is continuously pumped into a tubular reactor with a steam jacket, and a metathesis reaction occurs to generate ammonium bisulfate and hydrogen chloride. This reaction is an endothermic reaction, and the required heat is provided by the tube. The steam jacket of the type reactor is provided, the reaction temperature is 90°C, and the pressure is 0.7MPa. The obtained ammonium bisulfate solution is evaporated and concentrated, cooled and crystallized at 10°C, filtered and washed to obtain so...

Embodiment 3

[0066] The present embodiment provides a kind of technique of jointly producing ammonium sulfate and monochloromethane, with embodiment 1, specifically:

[0067] S1, 5349 grams of ammonium chloride and 13067 90wt% concentrated sulfuric acid are added into the premixing tank with stirring and filter screen for normal pressure premixing, the ratio of the amount of ammonium chloride and sulfuric acid is 1:1.2, pre The mixing temperature is 40°C.

[0068] S2. The premixed ammonium chloride sulfuric acid solution is continuously pumped into a tubular reactor with a steam jacket, and a metathesis reaction occurs to generate ammonium bisulfate and hydrogen chloride. This reaction is an endothermic reaction, and the required heat is provided by the tube. The steam jacket of the type reactor is provided, the reaction temperature is 145°C, and the pressure is 1.3MPa. The obtained ammonium bisulfate solution is evaporated and concentrated, cooled and crystallized at 38°C, filtered and wa...

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Abstract

The invention relates to a technology for jointly producing ammonium sulfate and chloromethane. The technology specifically comprises steps of: S1, premixing ammonium chloride with sulfuric acid at normal pressure; S2, pumping the sulfuric acid solution of the ammonium chloride obtain in step S1 into a tubular reactor, and thus obtaining ammonium bisulfate and hydrogen chloride gas; S3, preparing the ammonium bisulfate obtained in step S2 to form aqueous solution, and performing ammonolysis reaction in an ammonification column so as to obtain ammonium sulfate; S4, guiding the hydrogen chloride gas obtained in step S2 into a drying column 1 to be dried, and filling the dried hydrogen chloride gas into a fluidized bed reactor together with gaseous methanol so at to obtain a chloromethane crude product; sequentially feeding the chloromethane crude product obtained in S4 into a water washing tower, an alkaline washing tower and a drying tower 2 so as to obtain pure chloromethane, and compressing and condensing the pure chloromethane to form high-purity liquid chloromethane. By utilizing the technology, ammonium and chlorine elements in ammonium chloride are fully and reasonably utilized, so that the joint production of ammonium sulfate and chloromethane is realized, the industrial structure is optimized, and a new method is provided for comprehensively utilizing the ammonium chloride.

Description

technical field [0001] The invention belongs to the field of chemical technology, in particular to a process for jointly producing ammonium sulfate and methyl chloride by using ammonium chloride, sulfuric acid and methanol. Background technique [0002] With the development of the soda industry, the output of by-product ammonium chloride is increasing year by year. At present, the main consumption channel of ammonium chloride in my country is to add compound fertilizer in the form of ammonium nitrogen, which is suitable for rice, cotton, vegetables and other crops, but for some "chlorine-avoiding crops", such as sweet potato, potato, sugar beet, sugarcane, flax , Tobacco, grapes, citrus, tea trees, etc. should not be used, otherwise their quality will be adversely affected. Ammonium chloride applied to root and tuber crops will reduce the starch content; applied to sugar beets, grapes, citrus and other plants will reduce their sugar content; applied to tobacco will affect it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/246C07C19/03C07C17/16
Inventor 唐印雷林刘朝慧陈辉姜新会饶丹匡向东
Owner BEIJING EDGEIN TECH
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