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Online pH adjusting device and online pH adjusting process of catalytic hydrogenation reaction

A regulating device, catalytic hydrogenation technology, applied in the direction of control/regulation process, chemical/physical/physicochemical fixed reactor, feeding device, etc., can solve the problems of high temperature and pressure, difficulty in measurement and adjustment, etc., to achieve Reduce the difficulty of operation and ensure the effect of high efficiency

Active Publication Date: 2015-04-22
ZHEJIANG HUAKANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a pH online adjusting device for catalytic hydrogenation reaction, the pH online adjusting device effectively solves the problem that it is difficult to measure and adjust pH in catalytic hydrogenation reaction due to excessive temperature and pressure

Method used

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  • Online pH adjusting device and online pH adjusting process of catalytic hydrogenation reaction

Examples

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Effect test

Embodiment 1

[0037] Example 1 pH online adjustment device for catalytic hydrogenation reaction

[0038] Such as figure 1 As shown, the pH on-line adjustment device of a catalytic hydrogenation reaction in this embodiment includes an external pipeline 2 connected between the material outlet of the reactor 1 and the material return port, and the external pipeline 2 is sequentially installed with a pneumatic switch valve 3, Cooler 4, gas-liquid separator 5, online pH meter 6, high-pressure plunger pump 7, check valve 8. The high-pressure plunger pump 7 is used to drive the material to circulate between the reactor 1 and the cooler 4 along the external pipe 2, and the check valve 8 ensures that the reaction material will not flow back when the high-pressure plunger pump 7 stops running.

[0039] The cooler 4 includes a housing 41, inside which is installed a snake pipe 42 with both ends connected to the external pipe 2, the housing 41 is also provided with a cooling water inlet and a cooling ...

Embodiment 2

[0048] Example 2 pH Online Adjustment Process of Catalytic Hydrogenation of Maltitol

[0049] A kind of pH on-line adjustment process of maltitol catalytic hydrogenation reaction in this embodiment comprises the following steps:

[0050] (1) Adjust the pH value of the maltose liquid (concentration is 50%) in the metering tank to 6.8, then squeeze it into the reaction kettle together with the Raney nickel catalyst by the high-pressure plunger pump, under the hydrogen pressure of 8.0-9.5Mpa, temperature 135-145 Under the condition of ℃, the catalytic hydrogenation reaction starts;

[0051] (2) Set the pH adjustment range of the online pH meter: the upper limit is 7.0, the lower limit is 6.5; set the pressure range of the hydrogen decompression tank at the same time: the upper limit is 2.0Mpa, and the lower limit is 0.5Mpa;

[0052] (3) When the catalytic hydrogenation reaction in step (1) is carried out for about 10 minutes, slowly open the pneumatic switch valve, so that the m...

Embodiment 3

[0059] Example 3 pH Online Adjustment Process of Catalytic Hydrogenation of Sorbitol

[0060] A kind of pH on-line adjustment process of sorbitol catalytic hydrogenation reaction of the present embodiment, comprises the following steps:

[0061] (1) adjust the pH value of the glucose solution (concentration is 52%) in the measuring tank to be 7.5, then squeeze it into the reaction kettle together with the Raney nickel catalyst by the high-pressure plunger pump, at a hydrogen pressure of 9.0-11.5Mpa, a temperature of 125-135 Under the condition of ℃, the catalytic hydrogenation reaction starts;

[0062] (2) Set the pH adjustment range of the online pH meter: the upper limit is 8.5, the lower limit is 7.0, and the pressure range of the hydrogen decompression tank is set at the same time: the upper limit is 2.5Mpa, and the lower limit is 0.5Mpa;

[0063] (3) When the catalytic hydrogenation reaction in step (1) was carried out for about 15 minutes, the pneumatic switch valve was...

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Abstract

The invention discloses an online pH adjusting device and an online pH adjusting process of catalytic hydrogenation reaction. The online pH adjusting device comprises a material cooling system, an online pH detection unit, an alkaline liquid supplementing unit and a control unit, wherein the material cooling system is communicated with a reaction kettle, and a material circulating loop is formed between the material cooling system and the reaction kettle; the online pH detection unit is used for detecting a pH value of a material cooled by the material cooling system; the alkaline liquid supplementing unit is used for conveying alkaline liquid into the reaction kettle; the control unit is used for receiving a signal of the online pH detection unit and controlling the alkaline liquid supplementing unit to be started and stopped according to the signal. The material cooling system and the reaction kettle form the material circulating loop, the pH value of the cooled material on the material circulating loop and adjusted according to the measurement result, and the variation of the pH value in the reaction process can be monitored in real time, so that the pH value in the entire catalytic hydrogenation reaction process is stable, the high efficiency of the catalytic hydrogenation reaction can be guaranteed, automatic control for the entire process is adopted, and the operation difficulty of workers can be alleviated.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation reaction, and in particular relates to an online pH adjustment device and process for catalytic hydrogenation reaction. Background technique [0002] In the presence of a catalyst, the chemical reaction of organic matter with hydrogen is called catalytic hydrogenation. Catalytic hydrogenation reaction can be divided into two types: catalytic hydrogenation and catalytic hydrogenolysis. Among them, in the presence of a catalyst, organic matter containing unsaturated bonds reacts with hydrogen to hydrogenate part or all of the unsaturated bonds, which is called catalytic hydrogenation. That is, catalytic hydrogenation; if organic matter containing carbon-heterobonds reacts with hydrogen in the presence of a catalyst, the carbon-heterobonds are broken and decomposed into two parts of hydrogenation products, which is catalytic hydrogenolysis. [0003] In catalytic hydrogenation reaction, pH valu...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J19/18B01J4/02
CPCB01J19/0006B01J19/0086B01J2219/00177
Inventor 廖承军郑毅徐小荣方顺成贾宏元胡军宏夏安卫龚小平詹国平胡岳宏
Owner ZHEJIANG HUAKANG PHARMA
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