A method for purifying high-purity hydrogen chloride in a tetrachlorethylene plant
A technology of tetrachlorethylene and hydrogen chloride, which is applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve the problems of equipment load reduction production, economic benefits cannot be maximized, etc., and achieve the effect of reducing the discharge of three wastes and improving benefits
Active Publication Date: 2017-10-24
LUXI CHEM GRP
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Problems solved by technology
These gases are usually used to prepare low-value dilute hydrochloric acid. As a result, when hydrochloric acid is unsalable, the load of the device will be reduced due to the expansion of hydrochloric acid storage, and the economic benefits cannot be maximized.
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Embodiment 1
[0021] The process is divided into two units, a hydrogen chloride pretreatment unit and a hydrogen chloride rectification unit.
[0022] (1) Hydrogen chloride pretreatment unit
[0023] The crude HCL gas (82.3%wtHCL, 13.5%wt chlorine, a small amount of carbon tetrachloride, carbon dioxide and nitrogen from the tertiary cooling separator of the tetrachlorethylene plant, the temperature is -25 to -5°C) is preheated by raw materials The device is preheated to 20-50°C and then enters the sulfuric acid drying tower (temperature 15-25°C) for drying and dehydration. The dried crude hydrogen chloride gas is boosted to 1.1-1.9Mpa by a hydrogen chloride compressor and then enters the rectification process.
[0024] (2) Hydrogen chloride rectification unit
[0025] After pressurization, the crude hydrogen chloride gas enters the hydrogen chloride rectification tower and is purified by rectification. The rectification system makes use of the difference in volatilization ability of each c...
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Abstract
The invention relates to the field of purification of HCl (hydrogen chloride), in particular to a method for purifying high-purity HCl in a tetrachloroethylene device. Raw material gas from a tetrachloroethylene chlorination unit is dewatered and dried through a sulfuric acid drying tower, the dried gas enters an HCl rectifying tower after being pressurized, separation and purification are performed according to different boiling points of materials, and the high-purity HCl is obtained. With the adoption of the device, HCl containing 10-20% of chlorine and CCl4 which are produced by the tetrachloroethylene device can be recycled, discharge of three wastes is reduced, high-value HCl with the concentration larger than or equal to 99.8% is obtained, meanwhile, the separated pure chlorine and CCl4 are taken as raw materials and sent back to a tetrachloroethylene reaction system, and the efficiency of the device is improved.
Description
technical field [0001] The invention relates to the field of hydrogen chloride purification, in particular to a method for purifying high-purity hydrogen chloride in a tetrachlorethylene device. Background technique [0002] At present, the domestic production of tetrachlorethylene mainly adopts the thermal chlorination process of C1~C3 hydrocarbons. Compared with other processes, this technology has easy access to raw materials and easy mastery of the technology, and this process can use tetrachloride from ozone-depleting substances (ODS) Carbonization is the advantages such as raw material, but the production device utilizing this technology can produce a large amount of hydrogen chloride gas containing impurities (82.3% HCL, 13.5% chlorine, a small amount of carbon tetrachloride, carbon dioxide and nitrogen), and every 1 ton of tetrachloride produced Chlorinated carbon will produce about 0.84 tons of hydrogen chloride gas containing impurities. These gases are usually us...
Claims
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IPC IPC(8): C01B7/07
Inventor 张文陈运锋刘吉祥唐文明王静郑利文田松袁东立
Owner LUXI CHEM GRP