Tin-sulfur based catalysts for acetylene hydrochlorination

Abstract

：In the present work, tin-sulfur based catalysts was prepared using Na 2 SO 3 and (CH 3 SO 3) 2 Sn and was tested in acetylene hydrochlorination. Based on the analysis of experiments results, the acetylene conversion of (CH 3 SO 3) 2 Sn/S@AC is still over 90% after 50 h reaction, at the reaction condition of T = 200 o C, V HCl /V C2H2 = 1.1:1.0 and C 2 H 2-GSHV = 15 h-1. According to the results of X-ray photoelectron spectroscopy (XPS), HCl adsorption experiments, and acetylene temperature programmed desorption (C 2 H 2-TPD), it is reasonable concluded that the interaction between Sn and S not only can retard the oxidation of Sn 2+ in catalysts but also strengthen the reactant adsorption capacity of tin-based catalysts. Furthermore, results obtained from nitrogen adsorption/desorption and XPS proved that the CH 3 SO 3-can effectively decrease the coke deposition of (CH 3 SO 3) 2 Sn/AC and thus prolong the lifetime of (CH 3 SO 3) 2 Sn/AC.

Small molecule activation by well-defined compounds of heavy p-block elements

“…53 When sulfur or nitrogen carbon-dots are incorporated into the catalyst, the stability can be increased. 54…”

Improvements in protective measures in factories with acetylene hydrochlorination and ethylene oxychlorination techniques declined risk assessment levels and affected liver health status

“…(1) This research could not connect health indicators with position classification for failure on collection of position's classification from the physical examination process for consecutive years, the available data are not enough to verify the relationship between improvement on protective measures and liver health status. (2) In addition to the ventilation effect at indoor plants, we missed the effect of the natural ventilation requirement on ambient concentration alterations as numerous devices or facilities were placed outdoors; (3) General maintenance for sealing and airtight devices, valves, pipes, or sampling facilities were found to be improved in 2021, which radically inhibited evaporation and effusion of organic solvents or industrial dust, but we failed to verify their enhancement through the collection of quantitative data; (4) The very important catalyst HgCl 2 failed to be brought into detection as it existed in a solid pattern during the production process, and mercury-containing wastewater was not our primary purpose.…”

“…By contrast, the latter one is usually distributed in southeast coastal regions, as it requires imported ethylene, high-tech reaction equipment, and matched purification measures. As the world's largest production base for VCM and PVC, China's capacity in 2018 reached 23.53 million tons, and it is expected to reach 25.93 million tons by 2023 ( 4 ).…”