SU372198A1 - - Google Patents

Description

METHOD OF OBTAINING FOUR-CHLORIDE CARBON

one

This invention relates to a process for the preparation of perchlorocarbons.

A known method for producing carbon tetrachloride and perchlorethylene is the chlorination of aliphatic hydrocarbons Cj- € 4 or mixtures of hydrocarbons Ci- € 4 and their chlorine derivatives at 550-560 ° C and elevated pressure. The disadvantage of this method is that up to 35% of the feedstock in one cycle is not subjected to complete chlorination, which makes it necessary to carry out the process with recycling. The recycling of this method amounts to 60% of the feed to chlorination. In another variant of the method, perchlorethylene selected from the reaction mixture is used as recycling. In this case, chlorination comes with a large consumption of chlorine.

In order to reduce the formation of hydrogen chloride and reduce the consumption of chlorine, a process has been proposed to be carried out in the presence of an oxygen-containing gas.

As a source of raw materials use waste production of allyl chloride of the following composition (in wt.%):

Propylene 1-Chlorpropane

32.2 1.0 2-Chlorpropene 1-Chlorpropene

21.0 Allyl Chloride and PERCHLORETHYLENE

2-Chloropropane 1,25

Diallyl 0.61

Benzene0,3

1,2-Dichloropropane25,49

2,3-Dichlorpropets1,16

DMS-1,3-dichloropropene8,16

Gran-, 3-dichloropropene8,25

According to the proposed method, CL and Oz are supplied to the reaction zone, which allows to significantly reduce the consumption of Cl2, since at the time of formation of HC1 during the reaction, it is oxidized with air oxygen to Cb. Thus, two processes take place in one reactor: chlorination and oxychlorination, which significantly reduces the consumption of chlorine (xT, about 50 wt.%) With a simultaneous increase in the yield of the target products.

Desirable process conditions are a temperature of 400-550 ° C, a contact time of 5-9 seconds and a ratio of chlorohydrocarbons, chlorine and air of 1: 2.5: 2 - - 1: 6.1: 4.2. As a contact, you can use perlite, quartz sand, activated carbon brand AG-3 and pumice with a dispersion of 50-150 mesh.

Example 1. In a reactor filled to

0.35 1/3 of the volume with perlite dispersion of 60- 0.2 100 mesh, served (in g / hour): 22.0 chlorine, 60 production wastes of allyl chloride and 20.9 air. In a fluidized bed at 450 ° C and a contact time of 7 seconds. forms (in g / h): 78.6 catalysate, 13.6 hydrogen chloride, 6.9 chlorine and 2.8 combustion products.

The composition of the catalyzate (in wt.%): Ecu42,6

S2S437,4

CaCle10,2

CiCle1.0

SBS1b3,0

Balance 2.8

The output of the sum of ecu and C2CU for filed waste production of allyl chloride is 91.6 wt. %

Example 2. A reactor filled with 1/3 volume of perlite with a dispersity of 60-100 mesh is fed (in g / hour): 22 chlorine, 60 waste materials of allyl chloride and 20.9 air. In a fluidized bed at 480 ° C and a contact time of 7 seconds, it is formed (in g / hr): 86.2 catalyzate, 9.0 hydrogen chloride, 5.0 chlorine, and 2.7 combustion products. The composition of the catalyzate (in weight. %): ecu45,8

CaCU38,5

CaCle6,3

S4S1b1,2

SBS1b3,2

Balance 3.0

The output of the sum of ecu and CaCli on filed waste production of allyl chloride 98.9 weight. %

Example 3. In a reactor filled to 1/3 volume with perlite dispersion of 60-

100 mesh., Served (in g / hour): 22.0 chlorine, 60 production wastes of allyl chloride and 20.9 air. In the "fluidized bed" with a contact time of 7 sec / s and 520 ° C, the following is formed (in g / hour): 82.7 catalyzate, 9.9 chloride

hydrogen. 6.3 chlorine and 4.0 combustion products. The composition of catalyzate (in wt.%):

CC1.144,0

38.2

SAC 6.0 1.5

Cade

Cicle

4.5 3.4

SBS1b

Remainder

ecu and caci sums

Output

on allyl filed

chloride production waste 94.1 weight. %

The resulting reaction of Cb and Ps1 can be used during recycling, which leads to an increase in the yield of catalyzate on the missing feedstock.

Subject invention

A method of producing carbon tetrachloride and perchlorethylene by chlorinating a mixture of C3-C4 aliphatic hydrocarbons and their chlorine derivatives at an elevated temperature, followed by separation of the target products by a known method, characterized in that .