The method of automatic control of technological process for producing 1,2-dichloroethane from ethylene and chlorine abgasnorm

 

(57) Abstract:

The invention relates to the management of chemical-technological processes carried out in a cascade of reactors for producing 1,2-dichloroethane by chlorination of ethylene in recogida reaction mass. Automatic control of technological process for producing 1,2-dichloroethane from ethylene and abgasnorm chlorine is carried out at the process in a series of two reactor sites in the boiling liquid reaction mass. Use the site chlorination of the ethylene feedstock and site defloriani abgasnorm ethylene entering site chlorination. Flows condensed products partially returned in the corresponding reactor to maintain it level of the reaction mass and partially removed from the site by adjusting a preset flow rate of 100 percent chlorine. The amendment of the measured flow rate abgasnorm chlorine (which defines the specified flow target dichloroethane) lead by its temperature, pressure and concentration. The ratio of the flow of ethylene, which serves in excess, and the flow of chlorine regulate the temperature and pressure of ethylene. The coefficient of excess ethylene flow relative to the flow of 100% chlorine at the inlet of the reactor chlorine is Laura more the amount of surplus less. In proportion to the flow of ethylene was supplied with exhaust gases from the reactor-chlarotera, serves stream source abgasnorm chlorine in the reactor-declarator. The technical result - ensuring minimum loss of ethylene and abgasnorm chlorine during the process of chlorination of ethylene. 1 Il.

The invention relates to methods for management of chemical-technological processes carried out in a cascade of reactors, or more precisely to a twin process consisting of charator and declarator, producing 1,2-dichloroethane by chlorination of ethylene in recogida reaction mass produced products with the output of these products in the form of a gas mixture with inertly" contained in the original abgasnorm the chlorine gas, at the minimum acceptable service ratios for ethylene and the absence of chlorine in the gas emissions.

It can be used in the chemical and petrochemical industries.

A known method of controlling the process of obtaining dichloroethane from ethylene and chlorine (see "Method of controlling operation of the reactor direct chlorination of ethylene in the liquid dichloroethane". RF application for the invention 951189/95/25, (13) And from 09.11.95,, 6 01 J 19/00. G 05 DS 27/00 Shishkin H. A. and others - RU

Closest to the proposed technical essence is a way of managing the process of obtaining dichloroethane from ethylene and abgasnorm chlorine their interaction in the liquid boiling products formed by stabilization of a given ratio of the measured flow of ethylene and abgasnorm chlorine translated at the analyzer reading of the chlorine concentration in the source abgasnorm the chlorine gas chlorine flux on 100% chlorine (see Lerner, A. C., Povolotskiy A. M., A. C. C. the automatic control System synthesis reactor dichloroethane. - Chem. Prom., 1990, 3 (183), 55, formula 4).

The disadvantage of this method of control of technological process of obtaining dichloroethane from ethylene and abgasnorm chlorine is a large error in the calculation and regulation of the flow ratio of ethylene and chlorine, because of plotnostei from settlement, secondly, not implemented the requirement of change of this ratio when changing the concentration of chlorine in the original abgasnorm the chlorine gas, and, thirdly, there is provided the minimum permissible concentration of ethylene in the exhaust gases (the minimum loss of ethylene) in the required amount of chlorine.

The purpose of the invention is to automate the process for producing 1,2-dichloroethane from ethylene and abgasnorm chlorine.

The technical result when using the invention seeks to ensure minimum loss of ethylene and abgasnorm chlorine during the process of chlorination of ethylene in the liquid boiling reaction products with the output of the synthesized products in the form of a mixture of their vapors with "inertly source abgasnorm chlorine and unreacted ethylene and return part of the condensed product in the reactor to maintain the reaction mass in a twin node includes a reactor-XLERATOR with capacitor dichloroethane and the reactor-declarator abgasnorm ethylene charator with capacitor dichloroethane, for a given allowable value of the chlorine concentration in the exhaust gases of the gas emissions after condensation system dichloroethane reactor declaratory when the concentration changes of the ethane from ethylene and chlorine are described (see The method of obtaining EDC, Patent 2051891 from 10.01.1996, Russia).

The invention consists in the following.

The coefficient of excess ethylene flow relative to the flow of 100% chlorine at the inlet of the reactor-charator adjusted depending on the concentration of chlorine in the original thread abgasnorm chlorine: the concentration of chlorine is more, the amount of surplus less.

Calculate the mass flow rate of ethylene supplied with exhaust gases from the condenser, the products of reactor - charator in the reactor-declarator proportion which serves stream source abgasnorm chlorine in the reactor-declarator.

The coefficient of excess ethylene flow relative to the flow of 100% chlorine at the inlet of the reactor-declarator adjusted depending on the concentration of chlorine in the original thread abgasnorm chlorine (the chlorine concentration is greater, the amount of surplus less) and depending on the concentration of ethylene in the exhaust gases after the capacitors reactor declarator.

Implementation of the proposed method of control of technological process of obtaining dichloroethane from ethylene and abgasnorm chlorine illustrated by the following example.

Example

Process for producing 1,2-dichloroethane from utilitor P1 capacitor CN and fasoracetam D3 and reactor-declarator P4 with capacitor CN and fasoracetam D6.

Set value of flow rate of 100 percent chlorine in the reactor-XLERATOR P1 is being tested flow regulator abgasnorm chlorine FRC32, the measured value of which is adjusted by the temperature of TR12, pressure from PRC22 and concentration from QR51. In proportion to the specified thread 100% chlorine is regulated by the flow rate of ethylene in the reactor-XLERATOR P1 using the ratio controller FFRC31, the measured value of which is adjusted in its temperature from TR11 and pressure from PRC21, the concentration of ethylene in the stream equal to 100%, so the correction of its concentration are not possible). To ensure complete conversion of chlorine in the reactor-chlorate P1 coefficient of excess ethylene at its input And, working ratio controller ethylene/chlorine FFRC31, is adjusted by changing the concentration of chlorine in the original thread abgasnorm chlorine, as measured by the analyzer QR51, in accordance with addiction

A=As+kx(C022s-C022)

where A, As- current and base values of the coefficient of excess ethylene;

WITH022C022s- current and base values of the concentration of chlorine in the original thread abgasnorm chlorine;

k - factor.

The management node defloriani excess ethylene, soteriades the 33 the flow rate of ethylene F121with the flow of gases F12sent from node charator in the reactor-declarator P4, according to the formula:

F121= F01-F021C022(1+a43)/(1+243), (2)

where F01the flow rate of the ethylene feedstock in the reactor-XLERATOR P1,

F021the flow of the original abgasnorm chlorine in the reactor-XLERATOR P1,

43the selectivity of the process of synthesis of dichloroethane in the reactor-chlorate P1;

43=C2H3WITH3/S2H4WITH2in the stream of synthesized products;

is proportional to the flow of ethylene F121generated by the device FRC33, served in the reactor-declarator using the volume ratio of ethylene/chlorine FFRC34 additional flow source abgasnorm chlorine.

The coefficient of excess ethylene at the entrance to the reactor-declarator the ratio controller FFRC34 adjust to changes in the concentration of chlorine in the original abgasnorm chlorine in accordance with the dependence (1) and the concentration of ethylene in the exhaust gases after node defloriani from analyzer QR52.

Accordingly, the level chloretone P1 and declaratory P4 supported by return flows F132F232- part of the condensed products F13F23and the excess flows F is especialty minimum loss of ethylene with exhaust gases at an acceptable value of trace chlorine in these exhaust gases.

The method of automatic control of technological process for producing 1,2-dichloroethane from ethylene and abgasnorm chlorine that remains in the condensation of chlorine electrolytic chargesa and contains chlorine variable concentration and inert", in the boiling liquid reaction mass produced products with the output of these products in the form of a gas mixture with inertly" contained in the original abgasnorm the chlorine gas that is implemented in the form of a series of two reactor units: site chlorination of the ethylene feedstock, including reactor - charator and capacitor products, and host defloriani abgasnorm ethylene node chlorination, including reactor - declarator and the capacitor formed in the reactor products flows condensed products partially returned in the corresponding reactor to maintain the reaction mass, and partially removed from the site by adjusting a preset flow rate 100% chlorine adjusting the measured flow rate abgasnorm chlorine by its temperature, pressure and concentration, which determines the specified flow target dichloroethane, ratio control of the flow of ethylene, which serves in excess, and the flow of chlorine is adjusted measured led is using the value returned in the reactor stream and the condensed products characterized in that the ratio of excess ethylene flow relative to the flow of 100% chlorine at the inlet of the reactor - charator adjusted depending on the concentration of chlorine in the original thread abgasnorm chlorine: the concentration of chlorine is more, the amount of surplus less; calculate the mass flow rate of ethylene supplied with exhaust gases from the condenser, the products of reactor - charator in the reactor - declarator proportion which serves stream source abgasnorm chlorine in the reactor - declarator; ratio of excess ethylene flow relative to the flow 100%aqueous chlorine at the inlet of the reactor - declarator adjusted depending on the concentration of chlorine in the original thread abgasnorm chlorine (than the chlorine concentration is greater, the amount of surplus less) and depending on the concentration of ethylene in the exhaust gases after the capacitors reactor declarator.

 

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