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Lignocellulose ester catalysis method for preparing zinc sulfate from alkylation waste sulfuric acid

A technology for alkylating waste sulfuric acid and lignocellulose, applied in the direction of zinc sulfate, etc., can solve the problems of high process cost, incomplete and effective degradation and removal, expensive oxidant, etc., and achieve the effect of enhancing the oxidation of the system

Active Publication Date: 2016-05-04
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidant used in this method is relatively expensive, and the process cost is high; this method uses activated carbon for decolorization, which is easy to absorb and saturate, and the decolorization is often not complete, so this method cannot completely and effectively degrade and remove organic matter in waste sulfuric acid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of lignocellulose ester catalyst, this preparation method comprises the following steps:

[0032] (1) raw material pretreatment: drying the bagasse fibrous solid waste to a moisture content of less than 15%, pulverizing to obtain a fibrous solid waste powder passing through a 20-mesh sieve;

[0033] (2) High-speed mixing: Add the cellulosic solid waste powder, the esterification agent succinic acid and the auxiliary agent (zinc nitrate) into the mixer in a ratio of 100:5:1 and mix evenly to obtain a mixture;

[0034](3) Mechanically activated solid-phase reaction: Add the above-mentioned mixture into the mechanically activated solid-phase reactor according to the ratio of 100g:200ml of the volume of the milling medium, and perform ball milling reaction at a speed of 200rpm and a constant temperature water bath temperature of 30°C to achieve 0.5h activation After a period of time, stop stirring, take out the esterification product and the balls, and separ...

Embodiment 2

[0037] The preparation of lignocellulose ester catalyst, this preparation method comprises the following steps:

[0038] (1) Raw material pretreatment: drying cassava distiller's grains fibrous solid waste to a moisture content of less than 10%, pulverizing to obtain fibrous solid waste powder passing through a 25-mesh sieve;

[0039] (2) High-speed mixing: Add the fibrous solid waste powder, the esterification agent maleic acid and the auxiliary agent (zinc sulfate) into the mixer in a ratio of 100:10:2 and mix evenly to obtain a mixture;

[0040] (3) Mechanically activated solid-phase reaction: add the volume of the above-mentioned mixture into the mechanically activated solid-phase reactor according to the ratio of 100g:250ml, and perform ball milling reaction at a speed of 250rpm and a constant temperature water bath temperature of 35°C to achieve 0.6h activation After a period of time, stop stirring, take out the esterification product and the balls, and separate them to ...

Embodiment 3

[0043] The preparation of lignocellulose ester catalyst, this preparation method comprises the following steps:

[0044] (1) raw material pretreatment: drying cassava stalk fibrous solid waste to a water content less than 5%, pulverizing to obtain fibrous solid waste powder passing through a 30-mesh sieve;

[0045] (2) High-speed mixing: Add the fibrous solid waste powder, the esterification agent oxalic acid and the auxiliary agent (zinc carbonate) into the mixer in a ratio of 100:15:3 and mix evenly to obtain a mixture;

[0046] (3) Mechanically activated solid-phase reaction: add the above-mentioned mixture into the mechanically activated solid-phase reactor according to the ratio of 100g:300ml, and perform ball milling reaction at a speed of 300rpm and a temperature of 40°C constant temperature water bath to achieve 0.7h activation After a period of time, stop stirring, take out the esterification product and the balls, and separate them to obtain a lignocellulose ester mi...

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PUM

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Abstract

A lignocellulose ester catalysis method for preparing zinc sulfate from alkylation waste sulfuric acid is as below: adding alkylation waste sulfuric acid to zinc oxide or zinc hydroxide for reaction until a pH value is in a weak acid range to obtain a mixed solution; filtering the mixed solution to obtain leaching residue was and a reaction solution; then adding a catalyst of lignocellulose ester and an oxidant in the reaction solution to conduct a redox reaction; completely converting the organic matters in the alkylation waste sulfuric acid into CO2, H2O, N2 and other innocuous small molecules; conducting solid-liquid separation to obtain a fibrous residue and a purified liquid; and finally crystallizing the refined liquid to obtain a zinc sulfate product with industrial grade or feed grade purity. The lignocellulose ester not only has a catalytic function, but also has the function of an activating oxidant and adsorption decoloration; the production process does not introduce other impurities, and does not cause secondary pollution; the organic matters in the waste acid is completely oxidized and degraded; all the mother liquor is reused; and product quality is not affected.

Description

technical field [0001] The invention belongs to the field of organic wastewater treatment, in particular to a method in which lignocellulose ester is used as an oxidation catalyst to treat alkylation waste sulfuric acid and prepare zinc sulfate. Background technique [0002] With the improvement of international requirements for fuel oil, the alkylation method is widely used in refineries to produce isooctane, and the output is increasing rapidly. When using an alkylation unit to process and produce high-octane alkylated gasoline, sulfuric acid with a concentration of 98% must be used as a catalyst. Every ton of alkylated gasoline produced will produce 80-100kg of waste sulfuric acid, which contains 90 % of sulfuric acid, about 7% of organic matter and about 3% of water. The organic substances are mainly polymer olefins, diolefins, alkylsulfonic acids, sulfuric acid esters, and sulfides. These substances have dark color, sticky texture, and irritating odor, and it is diffic...

Claims

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Application Information

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IPC IPC(8): C01G9/06
CPCC01G9/06
Inventor 张燕娟黄祖强甘涛覃宇奔胡华宇覃廖青伍娟黄爱民杨梅覃杏珍沈芳冯振飞
Owner GUANGXI UNIV
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