Production method for producing trimethylolpropane by recycling carbide slag

• Main Authors: BIAN PINGGUAN, LIN SEN, QIN JILEI, LIANG SHENPING, WANG QIANG, LIU SHUANG, ZHU LULU, FANG XIAOJUAN, PEI FENG, GUO ZHONG, XIA TIANCI, DENG YONGLAN, GUO TIANZHU
• Format: Patent
• Language: Chinese; English
• Published: 30.12.2022
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention provides a production method for producing trimethylolpropane by recycling carbide slag, which comprises the following steps: preparing calcium hydroxide solution from carbide slag produced by preparing PVC (polyvinyl chloride) by an acetylene method as a catalyst, and adding the calcium hydroxide solution into a condensation reaction for preparing trimethylolpropane by taking n-butyraldehyde and formaldehyde as raw materials. According to the invention, a large amount of calcium hydroxide solid waste carbide slag generated during production of PVC by an acetylene method is used as a catalyst of a disproportionation method, so that the problem of large floating of each component of the carbide slag caused by the quality of raw material calcium carbide and process working conditions during utilization of the carbide slag is solved; the impurity content is high, the impurity type is complex, and carbide slag is difficult to effectively separate from a product when being removed. Meanwhile, the pro