Rectification tail gas treatment system for polyvinyl chloride production

• Main Authors: HU HAO, DU SHENGCHANG, GUO LELE, LI BIN, ZHANG XIANFENG, BAI YUN, LIU ZHONGSHENG, NIU JINGZONG, YANG WENLI, SUN TAO, ZHAI MO, ZHANG RUIBIAO, GAO SHENG
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2022
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The utility model discloses a rectification tail gas treatment system for polyvinyl chloride production. The rectification tail gas treatment system comprises a bubble-cap tower, a tail gas outlet of the rectification low-boiling-point tower is communicated with a gas inlet of the preheater, a gas outlet of the preheater is communicated with gas inlets of all the adsorption towers, desorption gas outlets of the adsorption towers are communicated with a gas inlet of the desorption gas buffer tank through pipelines, and all the adsorption towers are communicated with the pressure equalizing tank; and each adsorption tower is communicated with a vertical vacuum pump. The device has the advantages that diluted hydrochloric acid is introduced into the bubble-cap tower to absorb a large amount of hydrogen chloride gas in mixed gas, and the treated gas is introduced into the alkaline washing tower to treat a small amount of residual hydrogen chloride gas, so that the blockage phenomenon caused by a large amount of s