The method of selection of 1,2-dichloroethane

 

(57) Abstract:

The invention relates to petrochemistry, and more specifically to the separation of 1,2-dichloroethane. Produce 1,2-dichloroethane from VAT residue selection of vinyl chloride obtained by thermal or catalytic thermal cracking of 1,2-dichloroethane by distillation at a temperature of cube 90-135°C in the presence of additives. As an additive, a mixture of liquid chlorinated paraffin wax with density 0,98-1,02 g/cm3when the mass ratio to kubulau residue 1÷3:100. The technical result is an increase in the degree of selection of dichloroethane and reducing coke formation. 1 PL.

The invention relates to the petrochemical industry and, more specifically, to a method of allocation of 1,2-dichloroethane from waste products of vinyl chloride obtained by thermal cracking of 1,2-dichloroethane.

One of the waste products of vinyl chloride obtained by thermal or catalytic thermal cracking of 1,2-dichloroethane is VAT residue selection of vinyl chloride in these industries, containing 1,2-dichloroethane (EDC), 1,1,2-trichloroethane (TAE), 1,2-dichloropropane (DHP) and high-boiling resinous substance.

There is a method of allocating EDC from its mixtures with TAE and other chlorinated pleva ausich a boiling point above, than substances which emit preferably sulfolane (U.S. patent No. 4121978, 1978). This method of allocation EDC requires the use of a system of three distillation columns, one of which operates under vacuum. In addition, this method is used in a large number of scarce and expensive extractants that before recycling it is necessary to thoroughly clean, the residual content of EDC shall not exceed 2.5 ppm, and TAE be missing completely. This method does not exclude the coke formation in the first two columns.

In accordance with the technical solution described in U.S. patent No. 4145367, before allocation of EDC mixtures with other chlorohydrocarbons to clean it use a partial or full hydrogenation of impurities in the presence of palladium catalyst for the hydrogenation, i.e. with the use of explosive and flammable reagent is hydrogen and expensive catalyst.

Also known purification method and excretion of 1,2-dichloroethane, involving the use of heat being received for EDC. The process is carried out in a system of two columns, the second column operates under a vacuum of from 5 to 40 kPa (U.S. patent No. 4747914). Use razresheniya allocation process of EDC mixtures thereof, in accordance with the specified method is associated with significant costs and complexity of instrumentation.

A known method of separation by distillation of EDC VAT residue selection of vinyl chloride (cow) obtained by thermal or catalytic thermal cracking of 1,2-dichloroethane. The allocation of 1,2-dichloroethane (EDC) is carried out at a temperature Cuba 90-135°C in the presence of additives, which is sulfamido - product joint processing of pyrolysis condensate fraction and spent sulphuric acid and sludge - waste high-temperature homogeneous pyrolysis of petroleum products during their mass ratio 100:(2-10):(1-20) (RF patent №2009115, 1994).

The degree of selection EDC from cow in this process does not exceed 98%. The process is complicated by the significant koksoobrazovaniya. Sulfatase is a corrosive substance that leads to the use of equipment to protect against corrosion and host to neutralize the catalyst.

The present invention, therefore, was the creation of a more technological and economical way of separating 1,2-dichloroethane with a high degree of isolation and low koksoobrazovaniya.

Formulated ass VAT residue selection of vinyl chloride, the resulting thermal or catalytic thermal cracking of 1,2-dichloroethane by distillation at a temperature of cube 90-135°C in the presence of the additive as an additive, a mixture of liquid chlorinated paraffin wax with density 0,98-1,02 g/cm3when the mass ratio to kubulau residue 1-3:100.

In accordance with the present invention 1,2-dichloroethane is recovered from waste for the production of vinyl chloride (cow), representing VAT residue selection of vinyl chloride obtained by thermal or catalytic thermal cracking EDC, the following average composition, wt.%:

EDC 90-92

TAE 0,05-0,07

DHP 0,01-0,02

High-boiling resinous components of the Rest

Distillation above cow carried out in the presence of liquid chlorinated paraffin wax stamps CP-30, produced by THE 6-01-5-63-94. The chlorinated paraffin wax - storable products that do not decompose when heated and do not react with the components of cow, produced by chlorination of treated liquid paraffin having a boiling point 190-345°C. the Average molecular weight of a liquid chlorinated paraffin wax is in the range from 260 to 464.E., density - 0,98-1,02 g/cm3.

The invention is illustrated in the following example concretelarge cow and CP-30 ratio, the corresponding claimed in the present invention, the products of distillation are collected in the receiving tank. The parameters and results of the allocation process EDC from cow shown in the table.

Examples 7 and 8 (comparative)

The allocation method EDC is carried out in accordance with examples 1-6, except that the ratio of CP-30:cow stand outside the stated mass. The parameters and results of the allocation process EDC from cow shown in the table.

Examples 9 and 10 (comparative)

The allocation method EDC is carried out in accordance with examples 1-6, except that the process is carried out at a temperature below (example 9) and above (example 10) of the declared values.

Examples 11 and 12 (comparative)

Selection EDC carried out in accordance with the method of the prototype. Charged to the reactor, cow, sulfones and oil sludge in the ratio shown in the table. The mixture is heated to the boiling temperature, incubated 2 h, add sodium hydroxide solution and distilled EDC. The parameters and results of the allocation process EDC from cow shown in the table.

As can be seen from the table on offer, in accordance with the present invention, consideration additional nodes for the neutralization of the acid reaction products and catalyst, but also more economical. The latter is achieved by increasing the degree of separation of target product, reduce coke formation, increase turnaround of equipment and reduce energy and labor allocation ton of EDC.

The method in accordance with the present invention can be used in existing and newly constructed petrochemical industry associated with the production of vinyl chloride.

The method of selection of 1,2-dichloroethane from VAT residue selection of vinyl chloride obtained by thermal or catalytic thermal cracking of 1,2-dichloroethane by distillation at a temperature of cube 90-135°C in the presence of additives, characterized in that as an additive, a mixture of liquid chlorinated paraffin wax with density 0,98-1,02 g/cm3when the mass ratio to kubulau residue 1-3:100.



 

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