SU594995A1 - Benzene chlorination catalyst - Google Patents

Description

(54) CATALYST FOR CHLORINATION OF BENZENE

one

This invention relates to catalysts for the chlorination of benzene.

Catalysts for the chlorination of benzene are known, which include ferric chloride, aluminum chloride and other Lewis acids 1.

However, the selectivity of such catalysts is low, resulting in the formation of more exhaustive chlorination products and a large amount of polluted wastewater, which is obtained by purifying the reaction material from the catalyst.

The prototype of the invention is the use of metal organosiloxanes (reference) as catalysts for the chlorination of benzene 2.

However, such catalysts have a low selectivity to produce l-dichlorobenzene. The ratio of para-isomer to ortho-isomer is 2.24.

The purpose of the invention is the development of a highly active catalyst selective in relation to the formation of p-dichlorobenzene, which is increasingly used in industry.

The catalyst for chlorination is iolpalumophenylsiloxane, which is obtained by distilling off the solvent from a solution of this compound in a mixture of toluene with

2

butanol at a residual pressure of 3--5 mm Hg. Art. and a gradual rise in temperature to.

This solution is manufactured by the industry under the brand of full-aluminum-phenylenesiloxane lacquer 1 O-810.

Example. From 100 g of varnish KO-810 under vacuum 3-5 mm of mercury. Art. the solvent is distilled off, gradually increasing the temperature to

70 ° C. After the solvent has been recovered, 50 g of the new product are obtained. The polyalumino-organosiloxane prepared in this way is found in the chlorination of beisol. ReconH1O is carried out at 70 ° C, the chlorine feed rate is 0.37 g / min. The amount of catalyst is 0.1 - 2 weight. % The reaction mixture was analyzed by chromatography. The data obtained are presented in the table in comparison with the results of chlorination of benzene with chlorine on chlorine

iron and known catalysts.

The table shows that the proposed catalyst has a high catalytic activity in the chlorination reaction. The output of chlorobenzene on the target catalyst 74,4%,

ferric chloride 48.2%. Selectivity for the α-dichlorobenzene is expressed by the ratio of the para-isomer to the ortho-isomer, rabbi 2.82, for ferric chloride, 1.73. Recycling is also possible.

 Taken for sravienk.

 AJN-standard, in which the carrier is aluminosilicate. SGN-standard, in which the carrier is silica gel.

the proposed catalyst in the chlorination reaction.

Claims (2)

1.MoippHCOH R., Boyd R. Organic Chem. M., “Peace, 1974, p. 340. 2. For the number of 2078207, cl. In 01J 31/02, 1974, according to which a decision was made to issue an author's certificate.