SU732275A1 - Method of automatic control of diacetone-2-keto-l-gulonic acid hydrate production process - Google Patents

Description

-keto-b-gulonic acid, through pipeline 3 to the mixer 2 - hydrochloric acid. The mixture obtained in the mixer is fed to the reactor 4, into which the pipeline hydrochloric acid is supplied via pipeline 5. The consumption of the diacetone-2-keto-b-gulonic acid sodium salt in mixer 2 is measured using sensor 6 and adjusted using controller 7, acting on the actuator 8. The consumption of hydrochloric acid fed to mixer 2 is measured using sensor 9 and adjust with regulator 10, affecting the actuator 11. The pH of the mixture after mixer 2 is measured with sensor 12 and adjusted with regulator 13, adjusting the task to controller 10. Hydrochloric acid consumption in the reactor 4 is measured using the sensor 14 and comfort using controller 15, acting on actuator 16. The pH value of the reaction mass in reactor 4 is measured with sensor 17 and adjusted with controller 18, adjusting the setting to controller 15. The reaction mass level in reactor 4 is measured using sensor 19 and regulate using the controller 20, the impact on the actuator 21, thereby measuring the flow rate of the reaction mass (suspension from reactor 4). The temperature in the reactor 4 is measured by means of the sensor 22 and adjusted by means of the controller 23, which is influenced by the actuator 24 to the flow of brine into the cooling jacket of the reactor 4.

When one of the discharges of sodium salt solutions is changed, Discheton-2-keto-b-gulonic or hydrochloric acids or both of the dispensers simultaneously adjust the values of the dispenses using the controllers 7 and 10. In the case of changes in the content of free alkali in a solution of the sodium salt of diacetone-2-keto-L-gulonic acid, for example, decreasing it, the pH value of the reaction mixture after mixer 2 is also reduced. 10 to reduce the consumption of hydrochloric acid, which brings the pH of the reaction mixture after the mixer to a predetermined value. In the above situations change

Technological operations, min

Filling the reactor with blender ingredients

Feed the hydrochloric acid solution to the reactor

total consumption of solutions. This causes the pH of the reaction mass in the reactor 4 to deviate from the predetermined value with a stable flow rate of hydrochloric acid. To prevent a significant deviation of the p-value of the reaction mass in the reactor 4 from the given value, the flow rate of solution is. The pipelines 1 and 3 are summed up in the adder 25 and this signal is fed to the controller 15. The pH of the reaction mixture in the reactor 5 is adjusted by the controller 18, which can change the setting of the controller 15 when this parameter deviates from the set value. A change in the concentration of hydrochloric acid leads to a change in the pH of the measured media at stable flow rates of hydrochloric acid through pipelines 3 and 5. This disturbance is eliminated by regulators 13 and 18 by appropriate correction of the rear regulators 10 and 15, which stabilize the hydrochloric acid acid at a new level. A cooled solution of the Na salt of diacetone-2-keto-b-gulonic acid in the amount of 1700 l / h is fed to the mixer. 115 l / h of 20% hydrochloric acid are fed to it. The reaction mass from the mixer flows continuously into the reactor with a pH of 4.5-5.5. At the same time, it is continuously loaded with a stirrer at 109 l / h of 20% hydrochloric acid, ensuring due to its pH of the reaction mass in the reactor in the range of 1.7-2.0. The isolated hydrate crystals are continuously removed from the reactor together with the mother liquor. The consumption of the isreactor suspension is equal to the total consumption of solutions of the diacetone-2-ket-jj-gulonic acid Na-salt solution and hydrochloric acid fed to the reactor.

The proposed method ensures the continuity of the process both in filling the reactor with the initial ingredients and in draining the reaction mass in the reactor. The exposure time (40 min) for the proposed method is provided by the holding capacity of the reactor,

The table shows data on the duration of technological operations for the preparation of the diacetone-2-keto-L-gulonic acid hydrate by the known and proposed methods.

Way

Known (proposed 30 Continuously

ten

Continuously

Table continuation

Exposure of the reaction mass

Laboratory analysis of the pH of the reaction mass in the reactor

Unloading the reaction mass from the reactor

The table shows that the residence time of the reaction mass in the reactor by a known method is 80 minutes, and the proposed method is 40 minutes, i.e. the performance of the continuous process is twice as high as that of the batch process. The yield of hydrate during the implementation of a continuous process is reduced by 0.5%.

Claims (2)

Claim 1. Method for automatic control of the process of producing diacetone-2-keto-b-gulonic acid hydrate by mixing hydrochloric acid and sodium diacetone-2-keto-b-gulonic acid in a mixer, mixing the resulting mixture in a reactor with another stream hydrochloric acid, resulting in a change in the flow rate of hydrochloric acid supplied to the mixer, depending on the pH value of the mixture after the mixer, a change in the flow rate of hydrochloric acid, 40 Continuously 20 Continuously 80 40 my reactor, depending on the pH of the reaction mixture in the reactor, stabilization, temperature of the reaction mixture in the reactor, characterized in that, in order to improve the performance of the process, the flow rate of hydrochloric acid fed to the reactor, depending on the sum of the costs of salt hydrochloric acid and sodium salt of diacetone-2-keto-b-gulonic acid supplied to the mixer. 2. A method according to claim 1, further characterized in that it additionally: stabilizes the level of the reaction mixture in the reactor by varying the flow rate of the reaction mixture leaving the reactor. Sources of information taken into account in the examination 1. Proceedings of the All-Union Scientific and Technical Conference on the production of ascorbic acid. Belgorod, 1974, p.71-73 (prototype). f tJ ../ .. " . ll, 2g)  i. ",, .-" "