Method for preparing aluminum sulfate by catalyzing alkylated waste sulfuric acid with lignocellulose ester

A technology for alkylating waste sulfuric acid and lignocellulose, applied in the fields of aluminum sulfate, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high process cost, expensive oxidant, incomplete decolorization, etc., and achieve enhanced oxidation of the system function, improve the effect of decolorization effect

Active Publication Date: 2016-04-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the oxidizing agent that this method selects is more expensive, and the process cost is higher; This method selects activated carbon to carry out decolorization, and activated carbon is easy to adsorb and saturate, and decolorization is often not complete

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 fibrous solid waste powder, esterification agent succinic acid and auxiliary agent AlCl3 to 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 separate them to obtain a ligno...

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: mix fibrous solid waste powder, esterification agent maleic acid and auxiliary agent Al(NO 3 ) 3 Add it to 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 obtain a...

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: the fibrous solid waste powder, esterification agent oxalic acid and auxiliary agent Al 2 (SO4) 3 Add it to 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 mixture;

...

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Abstract

The invention relates to a method for preparing aluminum sulfate by catalyzing alkylated waste sulfuric acid with lignocellulose ester. The method includes the steps that the alkylated waste sulfuric acid is added into aluminum oxide or aluminium hydroxide to react until the pH value is faintly acid to obtain a mixed solution, and the mixed solution is filtered to obtain leached residues and a reaction solution; the catalyst lignocellulose ester and an oxidizing agent are added into the reaction solution to conduct a redox reaction, organic substances in the alkylated waste sulfuric acid are completely converted into harmless micromolecule substances such as CO2, H2O and N2, cellulosic filter residues and a refined solution are obtained through solid-liquid separation, and finally the refined solution is crystallized to obtain the industrial-grade aluminum sulfate product. The selected lignocellulose ester has the catalysis function, the oxidizing agent activating function and the adsorption and decoloration functions. No other impurities are introduced in the production process, so that secondary pollution is avoided; the organic substances in the waste acid are oxidatively degraded, the mother solution is completely recycled, and product quality is not affected and reaches the industrial-grade quality standard; the production process is easy to operate, safe and reliable and adopts normal-pressure operation, and investment is saved. The lignocellulose ester catalyst is biodegradable and can serve as a raw material of biofertilizer, and no three-waste emission exists in the production process.

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 aluminum 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 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74B01J31/06
CPCB01J31/06C01F7/74
Inventor 黄祖强张燕娟林国友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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