CN-121974357-A - Adsorption impurity removal method for recycling chlorosilane tail gas condensate

Abstract

The application provides an adsorption impurity removal method for recycling chlorosilane tail gas condensate, which comprises the steps that the chlorosilane tail gas condensate from a condensation source is conveyed to an inlet of an adsorption column unit through a conveying pump, the chlorosilane tail gas condensate enters the adsorption column unit and contacts with an adsorbent filled in the adsorption column, the adsorbent adsorbs ferroboron phosphate impurities in the chlorosilane tail gas condensate, and the adsorbed chlorosilane liquid flows out from an outlet of the adsorption column unit and is conveyed to a downstream rectifying system or a cold hydrogenation system through a pipeline for recycling.

Inventors

• XU SIXIA
• WANG ZHENGYUN
• DENG NAN
• Ma Hanya
• ZHANG LONGGANG
• LI QIANKUN
• LI YUANSHUANG

Assignees

• 新疆晶诺新能源产业发展有限公司

Dates

Publication Date

20260505

Application Date

20260227

Claims (7)

1. 1. The adsorption impurity removal method for recycling the chlorosilane tail gas condensate is characterized by comprising the steps of conveying the chlorosilane tail gas condensate from a condensation source to an inlet of an adsorption column unit through a conveying pump, enabling the chlorosilane tail gas condensate to enter the adsorption column unit and contact with an adsorbent filled in the adsorption column, adsorbing phosphorus ferroboron impurities in the chlorosilane tail gas condensate by the adsorbent, and conveying the adsorbed chlorosilane liquid out of an outlet of the adsorption column unit and through a pipeline to a downstream rectifying system or a cold hydrogenation system for recycling.
2. 2. The method of claim 1, wherein the chlorosilane tail gas condensate from the condensate source is delivered to the inlet of the adsorption column unit by a delivery pump, and the method comprises the steps of pressurizing the condensate source comprising VG1 system condensate or VG3 system condensate from a condensate storage tank through the delivery pump and then entering the adsorption column unit along a feed pipeline, and opening an inlet valve of the adsorption column unit to receive the chlorosilane tail gas condensate.
3. 3. The method of claim 1, wherein the chlorosilane tail gas condensate enters the adsorption column unit and is contacted with an adsorbent filled in the adsorption column, the adsorption column unit comprises at least one adsorption column, a shell of the adsorption column is made of corrosion-resistant materials, the adsorbent is filled in the adsorption column, the adsorbent has a selective adsorption effect on ferroboron impurities, the chlorosilane tail gas condensate flows through the adsorption column at a certain flow rate, the adsorbent captures ferroboron impurities through physical adsorption or chemical adsorption, and a distribution device is arranged in the adsorption column to enable the chlorosilane tail gas condensate to uniformly contact the adsorbent.
4. 4. The method of claim 3, wherein the adsorption column unit comprises at least one adsorption column, the adsorption column shell is made of corrosion-resistant materials, the adsorption column comprises an inlet pipeline and an outlet pipeline, the inlet pipeline is connected with the condensate storage tank and a downstream use point respectively, a valve group is arranged on the inlet pipeline and used for controlling the flow direction and the flow rate of the chlorosilane tail gas condensate, the adsorption column is of a cylindrical structure, and the inner space of the adsorption column is used for containing the adsorbent.
5. 5. The method of claim 1, wherein the adsorbed chlorosilane liquid flows out of the outlet of the adsorption column unit and is conveyed to a downstream rectifying system or a cold hydrogenation system for recycling through a pipeline, the method comprises the steps that the outlet of the adsorption column unit is connected with a purified liquid output pipeline, the purified liquid output pipeline directly conveys the adsorbed chlorosilane liquid to a feeding point of the downstream rectifying system or the cold hydrogenation system, and the adsorption column unit is provided with a plurality of sets of parallel structures or series structures, wherein the sets of parallel structures or series structures realize the respective treatment or continuous operation of condensate of different sources.
6. 6. The method of claim 3, wherein the adsorbent has selective adsorption effect on phosphorus ferroboron impurities, and comprises a special phosphorus removal adsorbent material, a special boron removal adsorbent material, a metal ion capturing material, a special phosphorus removal adsorbent material, a special boron removal adsorbent material and a metal ion capturing material which are filled in layers or mixed in the same adsorption column, wherein the special phosphorus removal adsorbent material, the special boron removal adsorbent material and the metal ion capturing material are respectively filled in different adsorption columns to form a serial impurity removal path.
7. 7. The method according to claim 5, wherein the adsorption column units are provided with a plurality of sets of parallel structures or serial structures, the method comprises the steps of switching the flow direction of one set of adsorption columns through the valve group when the adsorption column reaches adsorption saturation, enabling the other set of adsorption columns to enter a regeneration process, enabling the adsorption column reaching adsorption saturation to be integrated with a 806 section or a 807 section of the existing chlorosilane production section through pipelines, enabling an inlet of each adsorption column unit to directly take liquid from the section where the condensation source is located, and enabling an outlet of each adsorption column unit to return to a downstream use point of the section where the condensation source is located.

Description

Adsorption impurity removal method for recycling chlorosilane tail gas condensate Technical Field The invention relates to the technical field of information, in particular to an adsorption impurity removal method for recovering chlorosilane tail gas condensate. Background In the field of chemical production, the manufacturing process of chlorosilane has extremely high requirements on product quality and production efficiency, and the field is directly related to the raw material supply of high-end materials and electronic industry, and is an indispensable ring in industrial chains. Particularly in the aspects of tail gas treatment and resource recycling, how to effectively recycle and purify condensate generated in the production process becomes an important subject for guaranteeing production safety and economic benefit. However, currently, there are significant disadvantages to the commonly employed methods for treating chlorosilane tail gas condensate. The traditional technology often depends on a rectification process with high energy consumption, has high running cost and limited effect in removing harmful impurities, and is difficult to meet the requirement of high-purity products. Especially in the face of coexistence of various complex impurities, the existing method often cannot achieve comprehensive purification, and the condensate is caused to interfere with subsequent production links when being reused. A further problem is that the impurities such as phosphorus, boron, iron and the like contained in the condensate have different chemical properties and existing forms, which makes it difficult for a single treatment means to simultaneously cope with the removal requirements of various impurities. These impurities, if not effectively separated and captured, can directly affect the operational stability of downstream production equipment and even lead to catalyst deactivation. Taking phosphorus impurities as an example, the phosphorus impurities exist in a trace amount in condensate, but are extremely easy to react with other substances in a high-temperature reaction environment to form deposits which are difficult to remove, so that equipment pipelines are blocked or the reaction efficiency is reduced. And boron and iron impurities may cause other forms of chemical interference in different working sections, which commonly aggravates the purification difficulty. Therefore, how to design a method capable of efficiently and synchronously removing harmful substances such as phosphorus, boron, iron and the like according to different characteristics of various impurities in condensate liquid in the chlorosilane production process, and simultaneously ensuring continuity of system operation and compatibility with the existing production flow becomes a key problem of improving resource utilization efficiency and guaranteeing product quality. Disclosure of Invention The invention provides an adsorption impurity removal method for recovering chlorosilane tail gas condensate, which mainly comprises the following steps: The chlorosilane tail gas condensate from the condensing source is conveyed to an inlet of an adsorption column unit through a conveying pump, the chlorosilane tail gas condensate enters the adsorption column unit and contacts with an adsorbent filled in the adsorption column, the adsorbent adsorbs ferroboron phosphate impurities in the chlorosilane tail gas condensate, and the adsorbed chlorosilane liquid flows out from an outlet of the adsorption column unit and is conveyed to a downstream rectifying system or a cold hydrogenation system through a pipeline for recycling. The chlorosilane tail gas condensate from the condensation source is conveyed to an inlet of the adsorption column unit through a conveying pump, the condensation source comprises VG1 system condensate or VG3 system condensate, the chlorosilane tail gas condensate is pressurized from a condensate storage tank through the conveying pump and then enters the adsorption column unit along a feeding pipeline, and an inlet valve of the adsorption column unit is in an open state to receive the chlorosilane tail gas condensate. The chlorosilane tail gas condensate enters the adsorption column unit and contacts with an adsorbent filled in the adsorption column, the adsorption column unit comprises at least one adsorption column, the adsorption column shell is made of corrosion-resistant materials, the adsorbent is filled in the adsorption column and has a selective adsorption effect on ferroboron phosphorus impurities, the chlorosilane tail gas condensate flows through the adsorption column at a certain flow rate, the adsorbent captures ferroboron phosphorus impurities through physical adsorption or chemical adsorption, and a distribution device is arranged in the adsorption column to enable the chlorosilane tail gas condensate to uniformly contact with the adsorbent. The adsorption column unit comprises at least one adsorption c