The method of producing vinyl chloride

 

(57) Abstract:

The invention relates to an improved method of producing vinyl chloride. It is that in leaving the kiln decomposition gas flow to measure the amount of absorption of high-energy radiation, pressure and temperature on the measured values, calculate the working gas density, which subsequently are used to regulate the degree of conversion. The technical result is to reduce the formation of by-products and in particular the formation of coke. 3 C.p. f-crystals.

The invention relates to the technology of production of chlorinated hydrocarbons, in particular to a method for producing vinyl chloride.

A known method of producing vinyl chloride by thermal decomposition of 1,2-dichloroethane, which measure the temperature at the outlet of the furnace decomposition and the measured values are used to regulate the heating, for example of methane feed, designed to maintain the output temperature, preferably at a constant level (see EP 0276775 A3, C 07 C 21/06, 1988).

It was found that the impact of external factors even at a constant temperature at the outlet of the furnace decomposition cause some spread of values and the formation of by-products and energy consumption.

The objective of the invention is to develop a method of producing vinyl chloride, which helps to maintain the degree of transformation in the oven decomposition of dichloroethane as possible constant and thereby reduce the formation of by-products and in particular the formation of coke.

The problem is solved in the proposed method of producing vinyl chloride by thermal decomposition of 1,2-dichloroethane due to the fact that in leaving the kiln decomposition gas flow to measure the amount of absorption of high-energy radiation, pressure and temperature on the measured values, calculate the working gas density, which subsequently are used to regulate the degree of conversion.

As high-energy radiation, preferably using radioactive radiation.

Determination of the degree of transformation according to the invention has above all the advantage there, where they perform the total production in several parallel decomposition furnaces. By reducing the degree of conversion can be very easy to install, in what furnace was the turning is not as relied on the program.

The invention allows to accurately measure preframe adowanie by-products, in particular, the formation of coke, which, in turn, leads to a significant increase in time of the whole plant.

Radiometric measurement of gas decomposition according to the invention is as follows: place of measurement is insulated S-shaped tube length of 3,000 mm Was found at the bottom of the tube is formed so little deposits that they do not affect the measurement. The source of radiation, especially gamma rays, and the receiver is placed so against each other - at the bottom of the tube. At the same time in this part of the tube to measure pressure and temperature. The measured values are "working density, pressure and temperature are continuously entered into the computing device and the algorithms are converted to normal gas density decomposition. From this normal density can be determined in the computing device, the degree of transformation.

The definition according to the invention the degree of conversion of dichloroethane does not depend on the flow decomposition of dichloroethane. The decomposition process is carried out expediently with heat recovery gas decomposition.

Below is an example of executing izobretateley (consisting of dichloroethane, vinyl chloride, hydrogen chloride, and containing traces of by-products) are sent in insulated S-shaped curved tube length of 3,000 mm On located against each other bends tube mount the source and receiver of gamma radiation.

The data for the current measurement of the absorption of gamma-rays, pressure and temperature are sent to the unit for processing data, where the measured values is calculated working density. In the analog digital Converter operating density is converted to a normal density. Hence by iterative calculation method to determine the degree of transformation. It is used as a regulating value for the fuel supply.

1. The method of producing vinyl chloride by thermal decomposition of 1,2-dichloroethane, characterized in that in leaving the kiln decomposition gas flow to measure the amount of absorption of high-energy radiation, pressure and temperature on the measured values, calculate the working gas density, which subsequently are used to regulate the degree of conversion.

2. The method according to p. 1, characterized in that the high-energy radiation uses radioactive radiation.

4. The method according to one or more paragraphs.1 to 3, characterized in that regulate the degree of conversion of the fuel into the furnace decomposition.

 

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SUBSTANCE: catalyst is prepared from allyl chloride production wastes comprising 30-50% 1,3-dichloropropenes, 30-60% 1,2-dichloropropane, and 3-5% 1,2,3-trichloropropane, which are treated at 5-10°C with 30-50% dimethylamine aqueous solution in such amount as to ensure stoichiometric ratio of dimethylamine with respect to 1,3-dichloropropenes. Resulting mixture is held at 20-25°C for 0.5-1.0 h and then 40-44 sodium hydroxide solution is added in stoichiometric amount regarding dimethylamine, after which clarified waste is added to dimethylamine at 60-70°C and stirring in amount ensuring stoichiometric ratio of dimethylamine to 1,3-dichloropropenes contained in clarified waste. Mixture is aged for 2-3 h, organic phase is separated, and remaining interaction phase is supplemented by C1-C4-alcohol or benzyl alcohol at alcohol-to-dimethylamine molar ratio 1:(1-3).

EFFECT: reduced expenses on starting materials.

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3 cl, 2 ex

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SUBSTANCE: gas-phase thermal dehydrochlorination of 1,2-dichloroethane is conducted in presence of hydrogen chloride as promoter dissolved in feed in concentration between 50 and 10000 ppm.

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4 cl, 1 tbl, 8 ex

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EFFECT: improved method preparing.

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