SU414243A1 - - Google Patents

Description

This invention relates to an improvement in the process for producing vinyl chloride from acetylene and hydrogen chloride.

A known method for producing vinyl chloride by gas-phase hydrochlorination of acetylene at 80-200 ° C in the presence of a boiling catalyst layer is sublimated on activated carbon and the isolation of the target product by distillation. This method is characterized by an insufficiently high productivity of the catalyst used, as well as a relatively low acetylene conversion.

In order to eliminate these drawbacks, the catalyst used in the process is additionally promoted with lanthanum chloride.

The performance of the catalyst is increased by 15-20%.

Example 1. To prepare a catalyst containing mercuric chloride and lanthanum chloride in a molar ratio of YlgClz: LaCi i: 0.5, 10 ml of a 20% hydrochloric acid solution is poured into a porcelain dish, heated to 60-90 ° C, and then 1.0 g of mercury oxide is added in portions with stirring. After dissolving the mercury oxide, 15 ml of distilled water and 0.89 g of lanthanum sulphate are added. 12.7 g of activated carbon (particle size 0.25-0.31 mm) are poured into the resulting clear solution with stirring.

incubated for 2 hours and dried for 5-6 hours at 120-130 ° C. The content of the active substance (mixture of mercuric chloride and lanthanum chloride or their compounds) in the catalyst is 12.9 wt. % The catalyst is tested in a gradient-free (in terms of the temperature and concentrations of the components of the gas mixture) flow-circulation installation. The composition of the gas mixture at the inlet to the reactor (% by volume): 47 CaHg, 52 HC1, 1 N2. The flow rate is 300 Nl / min. The amount of catalyst used is 1.31 g (2.8 ml); it is diluted with 12.5 ml of glass chips (particle size 0.25-0.50 mm). Process temperature 220 ° C. Conversion of acetylene through 1, 10 and

20 hours of testing, respectively, 26.5; 19.0 and 16.9%, and I will remove vinyl chloride from 1 l of catalyst at 1 hour, respectively, 2170, 1600, 1420 g. When testing a catalyst without chloride

lanthanum, prepared similarly, the conversion of acetylene after 1, 10 and 20 hours is 21.5; 17.0 and 14.2%, and removal of vinyl chloride, respectively, 1810, 1440, 1200 g / l of catalyst / hour.

EXAMPLE 2 A catalyst was prepared and tested as in Example 1. The content of the active substance (mixtures of mercuric chloride and lanthanum chloride or their compounds) in the catalyst was 5.0 wt.%, The particle size of the catalyst 1-

2 mm, amount of catalyst used

2.10 g (4.8 ml), process temperature 240 ° C. Conversion of acetylene after 1 and 10 hours of testing 11.0 and 8.2%, and removal of vinyl chloride 540 and 400 g / l of catalyst / hour.

When testing a catalyst without lanthanum chloride, acetylene conversion after 1 and 10 hours of testing was 9.8 and 6.5%, and the removal of vinyl chloride was 480 and 320 g / l of catalyst / hour, respectively.

P | redmet invention

The method of obtaining vinyl chloride by gas-phase hydrochlorination of acetylene at elevated temperatures in the presence of a boiling catalyst LAYER - mercuric chloride on activated carbon and separation of the target product by a known technique, characterized in that, in order to increase the conversion of acetylene, the catalyst with the addition of lanthanum chloride .