SU1057504A1 - Method for automatically controlling process of producing diagetone-2-keto-alpha-gualic acid hydrate - Google Patents

Abstract

METHOD FOR AUTOMATIC CONTROL OF THE PROCESS OF OBTAINING DIACETON-2-CETO-1-GULFONIC ACID HYDRATE by stabilizing the supply of a solution of diacetone-2-ketogulonic acid salt to the mixer, controlling the flow of hydrochloric acid into the mixer depending on the pH of the mixture, and the mixture / mixture is mixed with a mixture / mixture of a mixture of hydrochloric acid and the mixture of hydrochloric acid in the mixer, depending on the pH of the mixture, and the mixture / mixture of a mixture of hydrochloric acid the mixture in the reactor by changing the discharge of the suspension from the reactor, stabilizing the temperature in the reactor and extreme control of the supply of hydrochloric acid to the reactor depending on the concentration of the target product in ktsionnoy mixture of m and n - h and w and u and in that, in order to increase the yield, further comprising extreme Noe regulation layer in the reactor zash ing on the targeted concentrations. Vogb product.

Description

The invention relates to the automation of technological processes and can be used in the chemical industry, for example in the production of ascorbic acid.

There is a known method of automatically controlling the process of obtaining diacetone-2-keto-1-gulon hydrate hydrate by changing the flow of hydrochloric acid into the mixer depending on the pH of the mixture after the mixer and changing the amount of hydrochloric acid to the reactor depending on the pH of the reaction mixture in the reactor flj,

The disadvantage of this method is the relatively low yield of the target product, due to the fact that the process control does not take into account the concentration of the target product. .

The closest to the present invention is a method for automatically controlling the process of obtaining diacetone-2-keto 1 | hydrate hydrate (GH) of nanoic acid (DKGK) by stabilizing the supply of the solution of diacetone-2-keto-1-gulonic acid salts to the mixer, controlling the flow of hydrochloric acid acid into the mixer, depending on the pH of the mixture after the mixer, adjusting the level of the reaction mixture in the reactor, changing the discharge of the suspension from the reactor, stabilizing the temperature in the reactor, and extreme controlling the flow of hydrochloric acid into the reactor isimosti of the desired product concentration in the reaction mixture of z

A disadvantage of the known method is the relatively low yield of the target product, since it does not take into account the residence time of the reaction mixture in the reactor during the recovery of the dKHKo hydrate.

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The purpose of the invention is to increase the yield of the target product.

This goal is achieved by the fact that according to the method of automatic control of the process of obtaining hydrate 2-keto-b-gulonic acid diacetone by stabilizing the supply of salt solution, 2-keto-gulonic acid diacetone into the mixer, controlling the supply of hydrochloric acid to the mixer depending on the pI value of the mixture after mixing, adjusting the level of the reaction mixture in the reactor by changing the discharge of the suspension from the reactor, stabilizing the temperature in

reactor and extreme regulation of the supply of hydrochloric acid to the reactor, depending on the concentration of the target product in the reaction mixture, in addition, extreme regulation of the level in the reactor is carried out depending on the concentration of the target product.

Under laboratory conditions, extreme dependencies were found for the concentration of the desired product in the reaction mixture on the p-educt of the raw material (hydrochloric acid) and the difficulty of the reaction mixture in the reactor.

Under industrial conditions, these extremes shift due to the change in the quality of the initial solution of the DKKO sodium salt. In this connection, obtaining the maximum yield of the target product under such conditions by stabilizing the pH of the reaction mixture in the reactor and the time it takes to stay in the reactor according to the dependences found does not allow one to achieve the goal.

Thus, with an insufficient residence time of the reaction mixture in the reactor, the entire diacetone-keto-and-gulonic acid hydrate does not stand out from the reaction mixture.

With excess time, the isolated diacetone-2-keto-1-gulonic acid hydrate is irreversibly depleted in a very accurate solution due to its low cta6HnbHocTbroo

On. is a schematic diagram of the implementation of the proposed control method.

The pipes 1 to the wire 1 to the mixer 2 serves a solution of sodium salt. DKHK, and pipeline 3 - hydrochloric acid (the first stream). The mixture obtained in the mixer is fed into the reactor into which hydrochloric acid is transported via pipeline 5 (second stream). Pipeline 6 is supplied with brine to the jacket of the reactor, and pipeline 7 pulls the suspension out of the reactor.

The control unit contains an 8-flow sodium salt DKGK sensor associated with a regulator 9 connected to an actuator 10 a sensor 11 of hydrochloric acid consumption 11 into a mixer connected to a regulator 12 connected to an executive Mechanism 13 a sensor 14 pH mix after mixer connected with controller 15 connected to controller 12, hydrochloric acid consumption sensor 16 to the reactor connected to controller 17 connected to actuator 18, pH sensor 19 of the reaction mass in the reactor connected to controller 20, connected with controller 17, a level sensor 21 connected to controller 22 connected to an actuator 23, a target product concentration sensor 2 connected to an extreme controller 25 connected to controllers 20 and 22, a temperature sensor 26, The method is carried out as follows. When changing one of the flow rates of the sodium salt salt of diacetone-2-keto-1-gulonic acid, hydrochloric acid, or both, the regulators 9 and 12 are restored given cost values In the case of a change in the content of free alkali in a solution of sodium salt diazetn-2-keto-1, - gulonic acid (for example, its reduction), the volume / quantity of the reaction mixture after mixing 2 will also decrease. In this case, the controller 15 generates a redirecting signal to the controller 12 to reduce the consumption of hydrochloric acid solution, which results in the pH of the reaction mixture after the mixer to a predetermined value. When changing the flow rate of hydrochloric acid fed to the reactor, the regulator 17 restores the flow rate. When the pH of the reaction mixture in the reactor changes, for example, due to instability of the concentration of hydrochloric acid supplied to the reactor, controller 20 outputs the corresponding correction signal to controller 17, which will cause the pH value of the reaction mixture in the reactor to the specified value i. , With changes in the level (residence time) of the reaction mixture in the reactor, the regulator 22 restores the setpoint value to the parameter. When the concentration of the target product decreases in relation to its extreme value, for example, due to the change in the quality of the sodium salt solution of divcetone-2-keto-1-gulonic acid or the residence time of the reaction mixture in the reactor, the extreme regulator 25 produces correction signals by regulator 20 and 22 When the temperature of the reaction mixture in the reactor changes, the controller 27 restores the specified value of this parameter. . The use of the proposed method in comparison with the known one allows an increase in the yield of the target product by 3%.

Claims (1)

METHOD FOR AUTOMATIC CONTROL OF THE PROCESS FOR PRODUCING DIACETONE-2-KETO-1.-HULOIC ACID HYDRA by unloading the suspension from the reactor, stabilizing the temperature in the reactor and extreme regulation of the flow of hydrochloric acid into the reactor depending on the concentration of the target process --------- --------------------- about the purpose of the product, the extremal reactor of the duct in the reaction mixture, especially since, increasing the yield of the target additionally carry out new regulation of the level in depending on the concentration of the target product.