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Method for joint production of liquid ammonia and methane chloride

A monochloromethane and combined production technology, applied in the field of chemical technology, can solve the problems of material waste, low element utilization rate, and increased cost, and achieve the effect of recycling, high utilization rate, and increased cost

Active Publication Date: 2014-04-23
BEIJING EDGEIN TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this invention is that the prior art adopts sulfuric acid, ammonium chloride and methyl alcohol to jointly produce the technology of ammonium sulfate and methyl chloride, the ammonium sulfate that obtains only uses as nitrogenous fertilizer, and element utilization rate is relatively low, simultaneously due to raw material Sulfuric acid cannot be recycled, resulting in waste of materials and increased costs, thereby providing a method for the joint production of liquid ammonia and monochloromethane with high element utilization and recyclable raw materials

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  • Method for joint production of liquid ammonia and methane chloride

Examples

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Effect test

Embodiment 1

[0030] Present embodiment provides a kind of method of joint production liquid ammonia and monochloromethane, as figure 1 The process flow chart is shown, and the specific steps are as follows:

[0031] (1) Add 5349g of ammonium chloride and 28392g of phosphoric acid solution with a concentration of 30wt% into the premixing tank with stirring and filter screen for normal pressure premixing. The ratio of phosphoric acid and ammonium chloride is 1:1.5, The premixing temperature is 15°C to obtain a suspension containing ammonium chloride;

[0032] (2) The suspension containing ammonium chloride premixed in step (1) is continuously sent into the tubular reactor with a steam jacket by a small pump, and a metathesis reaction occurs to generate diammonium hydrogen phosphate and hydrogen chloride, and the reaction For the endothermic reaction, the required heat is provided by the steam jacket of the tubular reactor, and the reaction is carried out at 60°C and 10KPa, and the reaction ...

Embodiment 2

[0046] Present embodiment provides a kind of method of joint production liquid ammonia and monochloromethane, specifically:

[0047] (1) Add 5349g of ammonium chloride and 4000g of concentrated phosphoric acid solution with a concentration of 98wt% into the premixing tank with stirring and filter screen for normal pressure premixing. The ratio of concentrated phosphoric acid and ammonium chloride is 1: 2.5, the premixing temperature is 45°C to obtain a suspension containing ammonium chloride;

[0048] (2) The suspension containing ammonium chloride pre-mixed in step (1) is continuously sent into a tubular reactor with a steam jacket with a small pump, and a metathesis reaction occurs to generate diammonium hydrogen phosphate and hydrogen chloride. React under the conditions of 100°C and 50KPa, and the reaction time is 50 minutes; the tubular reactor is followed by a steam-water separator, and the hydrogen chloride gas is continuously released from the top of the steam-water se...

Embodiment 3

[0061] Present embodiment provides a kind of method of joint production liquid ammonia and monochloromethane, specifically:

[0062] (1) Add 5349g of ammonium chloride and 6802g of concentrated phosphoric acid solution with a concentration of 80wt% into the premixing tank with stirring and filter screen for normal pressure premixing. The ratio of concentrated phosphoric acid and ammonium chloride is 1: 1.8, the premixing temperature is 30°C to obtain a suspension containing ammonium chloride;

[0063] (2) The suspension containing ammonium chloride pre-mixed in step (1) is continuously sent into a tubular reactor with a steam jacket with a small pump, and a metathesis reaction occurs to generate diammonium hydrogen phosphate and hydrogen chloride. React under the conditions of 70°C and 15KPa, and the reaction time is 25 minutes; the tubular reactor is followed by a steam-water separator, and the hydrogen chloride gas is continuously released from the top of the steam-water sep...

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Abstract

The invention relates to a method for joint production of liquid ammonia and methane chloride, which comprises the steps of mixing ammonium chloride and strong phosphoric acid at a substance amount ratio of (1:1.5)-(1:2.5), and reacting for 15-50 minutes under the conditions of 60-100 DEG C and 10-50KPa to obtain diammonium hydrogen phosphate and hydrogen chloride gas, wherein the hydrogen chloride gas is used for preparing methane chloride; the diammonium hydrogen phosphate is heated and decomposed into ammonia gas and a mixture of phosphoric acid and metaphosphoric acid; the ammonia gas is compressed and condensed to obtain liquid ammonia; the mixture of phosphoric acid and metaphosphoric acid can be directly circulated back and pre-mixed with ammonium chloride for a new round of reaction to realize circular utilization of the raw material. According to the method provided by the invention, liquid ammonia is obtained while methane chloride is prepared, and the utilization rate of nitrogen and chloride elements is relatively high; moreover, circular utilization of the raw material phosphoric acid is realized, and the material waste is avoided. In conclusion, the byproduct ammonium chloride in joint production is converted into hydrochloric ether and ammonia with a high added value, so that the ammonia and chloride in the ammonium chloride are sufficiently recycled and efficiently utilized and the waste is turned into wealth.

Description

technical field [0001] The invention relates to a method for jointly producing liquid ammonia and monochloromethane, which belongs to the technical field of chemical technology. 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 its combustibility and aroma, thus limiting the ...

Claims

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Application Information

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IPC IPC(8): C01C1/02C07C19/03C07C17/16
Inventor 唐印雷林刘朝慧李旭初冯瑞
Owner BEIJING EDGEIN TECH
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