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Strengthening system and process for preparation of hydrogen peroxide p-menthane

A technology of hydrogen peroxide and p-menthane, which is applied in the field of hydrogen peroxide p-menthane preparation, can solve the problems of poor oxidation effect, insufficient mixing, and low reaction rate, so as to achieve reduced gas-liquid ratio, stable product quality, The effect of oxidation process safety

Inactive Publication Date: 2021-01-05
NANJING YANCHANG REACTION TECH RES INST CO LTD
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AI Technical Summary

Problems solved by technology

[0006] For this reason, the present invention provides a hydrogen peroxide-enhanced system and process for the preparation of menthane to overcome the problems of low reaction rate and poor oxidation effect caused by insufficient mixing of oxygen-containing gas and oxidation raw materials in the prior art

Method used

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  • Strengthening system and process for preparation of hydrogen peroxide p-menthane

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Effect test

preparation example Construction

[0067] A kind of strengthening process for the preparation of menthane by hydrogen peroxide, comprising the steps:

[0068] Step 1: adding a specified amount of oxidized raw material to the liquid raw material tank 11 before running the system, and adding a specified amount of oxygen-containing gas to the gas raw material buffer tank 21;

[0069] Step 2: Start the system after the addition is completed, extract the oxidation raw material from the liquid raw material tank 11 through the feed pump 12, and extract the oxygen-containing gas from the gas raw material buffer tank 21 through the compressor 22;

[0070] Step 3: The oxidation raw material flows through the liquid feed preheater 13, the liquid feed preheater 13 heats the oxidation raw material to a specified temperature, the oxygen-containing gas flows through the gas feed preheater 23, and the gas feed preheater 23 Heating oxygen-containing gas to a specified temperature;

[0071] Step 4: After preheating, the oxidize...

Embodiment 1

[0077] Use the above-mentioned process to prepare hydrogen peroxide-menthane, wherein the oxygen-containing gas is selected air, and the oxidation raw material is selected from the p-menthane solution containing 5% mass percent hydrogen peroxide p-menthane, and the micro-interface generator 3 contains The gas-liquid ratio of oxygen gas to oxidizing raw material is 200:1, the reaction temperature in reactor 4 is 100°C, the reaction pressure is 0.1MPa, and the reaction time is 5h.

[0078] The content of the oxidation liquid containing hydrogen peroxide paramentan generated after the reaction was detected, and the test results were as follows: the mass content of hydrogen peroxide paramentan was 24.6%, and the acid value was 7.0mgKOH / L oxidation liquid.

Embodiment 2

[0080] Use the above process to prepare hydrogen peroxide p-menthane, wherein the oxygen-containing gas is selected air, and the oxidation raw material is selected to be a p-menthane solution containing 2.2% mass percent hydrogen peroxide p-menthane, and the micro-interface generator 3 contains The gas-liquid ratio of oxygen gas to oxidizing raw material is 500:1, the reaction temperature in reactor 4 is 105°C, the reaction pressure is 0.2MPa, and the reaction time is 4h.

[0081] The content of the oxidized solution containing hydrogen peroxide and menthane generated after the reaction was detected, and the test results were as follows: the mass content of hydrogen peroxide and menthane was 25.3%, and the acid value was 7.9mgKOH / L oxidized solution.

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Abstract

The invention relates to a strengthening system and process for preparation of hydrogen peroxide p-menthane. The strengthening system comprises a liquid phase feeding unit, a gas phase feeding unit, amicro-interface generator, a reactor and a separation tank. Compared with a traditional method, the method has the advantages that micron-scale bubbles are formed by crushing gas, and the micron-scale bubbles are mixed with an oxidation raw material to form a gas-liquid emulsion, so that the phase contact area of a gas phase and a liquid phase is increased, and the effect of enhancing mass transfer within a lower preset operation condition range is achieved; meanwhile, mass transfer is greatly enhanced, so that the gas-liquid ratio can be greatly reduced, and the energy consumption of subsequent gas circulating compression is reduced while the gas material consumption is reduced; and the method is low in process severity, high in production safety, low in product cost per ton and high inmarket competitiveness.

Description

technical field [0001] The invention relates to the technical field of hydrogen peroxide-menthane preparation, in particular to an intensified system and process for the preparation of hydrogen peroxide-menthane. Background technique [0002] P-menthane hydrogen peroxide (PMH) is an olefin emulsion polymerization initiator, mainly used as a polymerization initiator for styrene-butadiene rubber, ethylene-propylene rubber and nitrile rubber. In addition, PMH is also used as a cross-linking agent for unsaturated polyester and for the preparation of fragrances Wait. [0003] Oxidation of p-menthane with air or oxygen-enriched air is an important method to obtain p-menthane hydrogen peroxide. At present, the industrial production of hydrogen peroxide from the oxidation of menthane uses non-catalytic oxidation technology for menthane, which usually adopts a batch method to react at a temperature of 110 ° C to 140 ° C, using air as the oxidant, and the reaction time is as long as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C407/00C07C409/06B01J10/00
CPCB01J10/002C07C407/00C07C2601/14C07C409/06
Inventor 张志炳周政孟为民王宝荣杨高东罗华勋张锋李磊杨国强田洪舟曹宇
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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