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Method for reducing acidity of isooctyl nitrate synthesized by taking waste acid as raw material

A technology of isooctyl nitrate and raw materials, which is applied in the field of refining isooctyl nitrate with high acidity, can solve the problems of low cost and high acidity of isooctyl nitrate, and achieve the effects of low cost, easy decomposition, and reduced acidity

Active Publication Date: 2021-01-05
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current technical problems, the present invention provides a method for refining isooctyl nitrate with high acidity, which solves the problem of high acidity of isooctyl nitrate produced by recycling waste acid, with low cost and safe process

Method used

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  • Method for reducing acidity of isooctyl nitrate synthesized by taking waste acid as raw material
  • Method for reducing acidity of isooctyl nitrate synthesized by taking waste acid as raw material
  • Method for reducing acidity of isooctyl nitrate synthesized by taking waste acid as raw material

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Effect test

Embodiment 1

[0023] A kind of method that reduces taking spent acid as raw material synthetic isooctyl nitrate acidity:

[0024] (1) Configuration of mixed acid: with reused waste acid, 98% sulfuric acid, 98% nitric acid as raw material, configure mixed acid according to reused waste acid: 98% sulfuric acid: 98% nitric acid=1.8:1.2:1 (mass ratio), to be use;

[0025] (2) Set the reaction temperature to 15°C, and put the mixed acid and isooctyl alcohol into the microchannel reactor through the feed pump according to the molar ratio of 1.02:1 to react.

[0026] (3) A liquid separation tank is installed at the outlet of the reactor, and the reaction product enters the liquid separation tank. The crude ester enters the crude ester tank from the upper opening of the liquid separation tank, and the waste acid enters the waste acid secondary separation through the U-shaped pipe at the bottom of the liquid separation tank. Can.

[0027] (4) The crude ester in the secondary separation tank enters...

Embodiment 2

[0032] A kind of method that reduces taking spent acid as raw material synthetic isooctyl nitrate acidity:

[0033] (1) Configuration of mixed acid: with reused waste acid, 98% sulfuric acid, 98% nitric acid as raw materials, configure mixed acid according to reused waste acid: 98% sulfuric acid: 98% nitric acid=3:0.6:1 (mass ratio), to be use;

[0034] (2) Set the reaction temperature to 25°C, and put the mixed acid and isooctyl alcohol into the microchannel reactor through the feed pump according to the molar ratio of 1.1:1 to react.

[0035] (3) A liquid separation tank is installed at the outlet of the reactor, and the reaction product enters the liquid separation tank. The crude ester enters the crude ester tank from the upper opening of the liquid separation tank, and the waste acid enters the waste acid secondary separation through the U-shaped pipe at the bottom of the liquid separation tank. Can.

[0036] (4) The crude ester in the secondary separation tank enters t...

Embodiment 3

[0041] A kind of method that reduces taking spent acid as raw material synthetic isooctyl nitrate acidity:

[0042] (1) Configuration of mixed acid: with reused waste acid, 98% sulfuric acid, 98% nitric acid as raw material, configure mixed acid according to reused waste acid: 98% sulfuric acid: 98% nitric acid=2.2:1.2:1 (mass ratio), to be use;

[0043] (2) Set the reaction temperature to 20°C, put the mixed acid and isooctyl alcohol into the microchannel reactor through the feed pump according to the molar ratio of 1.05:1 to react.

[0044] (3) A liquid separation tank is installed at the outlet of the reactor, and the reaction product enters the liquid separation tank. The crude ester enters the crude ester tank from the upper opening of the liquid separation tank, and the waste acid enters the waste acid secondary separation through the U-shaped pipe at the bottom of the liquid separation tank. Can.

[0045] (4) The crude ester in the secondary separation tank enters the...

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Abstract

The invention belongs to the technical field of oil refining assistants, and particularly relates to a method for reducing acidity of isooctyl nitrate synthesized by taking waste acid as a raw material, which comprises the following steps of: synthesizing a crude product isooctyl nitrate by taking sulfuric acid, nitric acid, waste acid and isooctyl alcohol as raw materials through a micro-channelreactor, and performing two-stage separation on the crude product to separate the waste acid from the crude ester, pumping the separated crude ester into a primary fibrous membrane alkali washing section, and reducing the acidity of the crude ester to be below 100mgKOH / 100mL; subjecting the crude ester to alkali washing and enabling a product to enter a secondary fiber membrane alkali washing section, wherein the alkali liquor circulation amount is 200-500 kg / h, and reducing the acidity of the product to 3 mgKOH / 100 mL or lower; and carrying out secondary alkali washing, and then carrying outsilica gel dehydration to obtain a product. And an alkali washing solution of the secondary fiber membrane alkali washing section consists of low-carbon alcohol, organic amine, inorganic alkali and deionized water. The method solves the problem of higher acidity of isooctyl nitrate generated by recycling waste acid, and is low in cost and safe in process.

Description

technical field [0001] The invention belongs to the technical field of oil refining aids, and in particular relates to a method for refining high-acidity isooctyl nitrate. Background technique [0002] In recent years, with the popularization of National VI diesel oil, the cetane number index of diesel oil has attracted people's attention. It is costly and demanding to raise the cetane number directly through refining and chemical equipment, and the cetane number improver is used to increase the cetane number. The method of hexane number is welcomed by people because of its low cost and convenient use. Isooctyl nitrate is an excellent cetane number improver. Adding 100-3000ppm to diesel can increase the cetane number of diesel oil by 0.5-10 , the effect is remarkable, and it is a kind of fuel additive with good application prospect. [0003] At present, the synthesis process of isooctyl nitrate generally uses concentrated sulfuric acid as a catalyst, and nitric acid is este...

Claims

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Application Information

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IPC IPC(8): C07C201/02C07C203/04
CPCC07C201/02C07C203/04
Inventor 马雪菲梁万根崔卫华杨聪宗传晖杨后奇
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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