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Method for analyzing chlorine hydride in hydrochloric acid

A technology for hydrogen chloride and hydrogen chloride gas, which is applied in the field of analyzing hydrogen chloride, can solve the problems such as the discharge of hydrochloric acid waste liquid, and achieve the effects of reducing production accidents, saving investment and reducing costs.

Inactive Publication Date: 2009-09-09
张孟存
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for analyzing hydrogen chloride from hydrochloric acid, solve the problem of hydrochloric acid waste liquid discharge in production, and realize clean production

Method used

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Embodiment

[0016] A chemical plant with an annual output of 20,000 tons of trichlorosilane project uses hydrochloric acid deep analysis process to produce hydrogen chloride. Take dilute hydrochloric acid with a mass fraction of 18% and mix it with a calcium chloride solution with a mass fraction of 45% in a high-temperature desorption tower, heat the mixed solution to 120°C to 130°C through a reboiler, and obtain saturated water at the top of the tower. Hydrogen chloride gas obtains required hydrogen chloride gas through cooling and drying; The mass fraction obtained at the bottom of the tower is 1% dilute hydrochloric acid and 20% calcium chloride mixed liquid; the mass fraction obtained at the bottom of the tower is 1% Dilute hydrochloric acid and The calcium chloride mixture with a volume fraction of 20% is pumped into the concentration kettle, and calcium hydroxide solution is added to the concentration kettle to adjust the pH to 7-10, and heated to 145°C to concentrate, evaporate wat...

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Abstract

The invention relates to a method for analyzing chlorine hydride in hydrochloric acid. The method comprises the steps as follows: (1) dilute hydrochloric acid is mixed with calcium chloride solution in a high-temperature absorption tower, mixed solution is heated to 120-130 DEG C by a reboiler; hydrogen chloride containing saturated water is obtained at the top of the tower; the hydrogen chloride is obtained by cooling and drying and the mixed solution of the dilute hydrochloric acid and the calcium chloride is obtained at the bottom of the tower; (2) the mixed solution of the dilute hydrochloric acid and the calcium chloride obtained at the bottom of the tower is pumped to a concentration vessel by a pump; calcium hydroxide solution is added into the concentration vessel to adjust pH to 7-10 and is heated to 130-150 DEG C to be concentrated for vaporizing water; and the concentrated calcium chloride solution is returned to the dilute hydrochloric acid absorption tower to be used as intumescent agent for analyzing the dilute hydrochloric acid to carry out hydrochloric acid deep analyzing; and (3) excessive calcium chloride produced by the system is crystallized and filtered to obtain a side product calcium chloride, thereby keeping the calcium chloride system balance. The method realizes the clean production and produces no waste liquor. The method uses carbon steel equipment, reduces the cost and reduces the occurrence of accident at the same time.

Description

technical field [0001] The invention relates to a method for analyzing hydrogen chloride from hydrochloric acid, belonging to the technical field of inorganic chemistry. Background technique [0002] In fine chemical fields such as trichlorosilane, PVC, organosilicon, phosphate, and carbon five, hydrogen chloride gas is needed as a raw material to participate in the reaction. At present, the commonly used process uses concentrated hydrochloric acid as raw material to analyze the hydrogen chloride gas in hydrochloric acid through various processes. Due to the limitations of technology and conditions, in the original process route, concentrated hydrochloric acid is generally desorbed to a mass fraction of about 20%, so a large amount of by-product - dilute hydrochloric acid will be produced in the process of desorbing hydrogen chloride gas from concentrated hydrochloric acid . The existing treatment technology is to add a boiling breaker to hydrochloric acid with a mass frac...

Claims

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Application Information

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IPC IPC(8): C01B7/01
Inventor 张孟存孟祥考
Owner 张孟存
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