Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of method for producing hydrogen chloride gas from residual liquid of chlorosilane

A hydrogen chloride gas, chlorosilane residual liquid technology, applied in chlorine/hydrogen chloride and other directions, can solve the problems of high energy consumption and resource waste, and achieve the effects of reducing construction and operation costs, improving purity, and reducing energy consumption

Active Publication Date: 2018-06-15
KUNMING UNIV OF SCI & TECH
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the treatment method of chlorosilane raffinate in domestic polysilicon factories generally adopts lye treatment process, and the chlorine salt, silicon dioxide, silicate and other mixtures produced, the chlorine element in it cannot be returned to the system for resource utilization, resulting in waste of resources
[0005] At present, although there are hydrochloric acid methods for treating silicon tetrachloride (CN103058141A) and chlorosilane raffinate (CN105036081A) by-product hydrogen chloride gas, they all first convert the raw material into concentrated hydrochloric acid, and then thermally analyze the concentrated hydrochloric acid to obtain hydrogen chloride gas , this process requires a large amount of energy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of method for producing hydrogen chloride gas from residual liquid of chlorosilane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for producing hydrogen chloride gas from a chlorosilane raffinate described in this embodiment is characterized in that it comprises the following steps:

[0026] The main component of the chlorosilane raffinate that this embodiment handles is 100% SiCl 4 , 0% SiHCl 3 , 0% SiH 2 Cl 2 , 0% HCl, that is, taking pure silicon tetrachloride as an example, the processing capacity is 0.1t / h.

[0027] (1) Send 0.1t / h of chlorosilane raffinate into reaction kettle 1 containing saturated hydrochloric acid, and vigorously stir at 200r / min. ~39%), the hydrolysis reaction produces hydrogen chloride gas and hydrogen gas, the hydrogen chloride gas released by supersaturated hydrochloric acid, and the unreacted chlorosilane droplets or gas carried out by the air flow enter the absorption tower 2, and the hydrogen chloride gas in the tank 9 is collected with hydrochloric acid After hydrochloric acid hydrolysis and absorption, the absorption liquid is finally returned to the...

Embodiment 2

[0032] A method for producing hydrogen chloride gas from a chlorosilane raffinate described in this embodiment is characterized in that it comprises the following steps:

[0033] The main component of the chlorosilane raffinate that this embodiment handles is 90% SiCl 4 , 5% SiHCl 3 , 3% SiH 2 Cl 2 , 2% HCl, the treatment capacity is 0.1t / h.

[0034] (1) Send 0.1t / h of chlorosilane raffinate into reaction kettle 1 containing saturated hydrochloric acid, and stir vigorously at 300r / min. 36~37.5%) for hydrolysis, the hydrolysis reaction produces hydrogen chloride gas and hydrogen gas, hydrogen chloride gas released by supersaturated hydrochloric acid, unreacted chlorosilane droplets or gas carried out by the air flow enters the absorption tower 2, and is collected in the hydrochloric acid collection tank 9 After the hydrochloric acid is hydrolyzed and absorbed, the absorption liquid is finally returned to the reactor 1.

[0035] (2) The hydrogen and hydrogen chloride gas fr...

Embodiment 3

[0039]A method for producing hydrogen chloride gas from a chlorosilane raffinate described in this embodiment is characterized in that it comprises the following steps:

[0040] The main component of the chlorosilane raffinate that this embodiment handles is 80% SiCl 4 , 10% SiHCl 3 , 5% SiH 2 Cl 2 , 5% HCl, the treatment capacity is 0.1t / h.

[0041] (1) Send the chlorosilane residual liquid into the reactor 1 containing saturated hydrochloric acid at 0.1t / h, and stir vigorously at 400r / min. 33~36%), the hydrolysis reaction produces hydrogen chloride gas and hydrogen gas, the hydrogen chloride gas released by supersaturated hydrochloric acid, and the unreacted chlorosilane droplets or gas carried out by the air flow enter the absorption tower 2, and are collected in the hydrochloric acid collection tank 9 After the hydrochloric acid is hydrolyzed and absorbed, the absorption liquid is finally returned to the reactor 1.

[0042] (2) The hydrogen and hydrogen chloride gas f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for producing hydrogen chloride from chlorosilane raffinate and belongs to the field of recycling of polycrystalline silicon production waste. According to the method, the chlorosilane raffinate is stirred at a high speed and hydrolyzed in a reaction kettle containing saturated hydrochloric acid, hydrogen and hydrogen chloride which are produced through hydrolyzing, hydrogen chloride released by oversaturated hydrochloric acid and chlorosilane fogdrops or gas which is brought out by a gas flow and does not react completely enter an absorbing tower, chlorosilane gas and partial hydrogen chloride are absorbed by nearly saturated hydrochloric acid, an absorption liquid becomes saturated hydrochloric acid and returns to the reaction kettle, and residual hydrogen and hydrogen chloride are subjected to water cooling and deep refrigeration and then participate in a trichlorosilane synthesis procedure. According to the method, principles that hydrogen chloride is produced through hydrolyzing of the chlorosilane raffinate, the hydrolyzing reaction of the chlorosilane raffinate is an exothermic reaction and saturated hydrochloric acid cannot absorb hydrogen chloride are utilized, the chlorosilane raffinate is hydrolyzed with saturated hydrochloric acid, hydrogen chloride is directly obtained, so that special hydrochloric acid resolution equipment is omitted, energy consumption is reduced, and construction and running costs of a production device are reduced.

Description

technical field [0001] The invention relates to a method for producing hydrogen chloride gas from a chlorosilane raffinate, and belongs to the field of polysilicon production waste recycling. Background technique [0002] The domestic mainstream polysilicon production process is the Siemens method, which is mainly the synthesis of hydrogen chloride, the synthesis of trichlorosilane, the purification of trichlorosilane, the reduction of trichlorosilane, and the hydrogenation of silicon tetrachloride. Since the domestic polysilicon factories have not yet fully mastered the technology of producing polysilicon by the improved Siemens method, closed-loop production cannot be realized, and a large amount of chlorosilane raffinate is inevitably produced in the process. [0003] Chlorosilane raffinate mainly comes from the synthesis process of trichlorosilane, the dry separation process of synthesis gas, the rectification and purification process of trichlorosilane, the dry separati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/01
CPCC01B7/01
Inventor 黄兵李银光张雯雯陈樑郑惠文
Owner KUNMING UNIV OF SCI & TECH