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Method for preparing caustic soda and coproducing calcium carbonate by using waste alkali liquid generated during ethylene cracking

A technology for ethylene waste lye and ethylene cracking, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of loss and large processing costs, and achieve reduced processing costs and guaranteed quality , The effect of eliminating pollution sources

Inactive Publication Date: 2011-09-14
何侠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these strong alkalis are discharged directly, it will cause irreparable losses to nature. If they are neutralized with acidic substances and then discharged reasonably, it will inevitably result in a large processing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 500 kilograms of pyrolysis ethylene waste caustic soda, wherein contain sodium sulfide 15% and sodium carbonate 4% etc.; Its preparation steps are:

[0019] 1) Heating the cracking ethylene waste lye to 40-50 degrees Celsius, wait for all the oil and soap to dissolve and float on the waste lye, then collect the oil and saponins to develop new products; cut out the waste lye for the next step deep processing;

[0020] 2) Add calcium hydroxide to the above-mentioned waste lye and react in a glass-lined reactor. The pure mass ratio of sodium sulfide and calcium hydroxide in the waste lye is 1:0.75, and the agitator that is started makes the solution chemically Reaction; The reaction generates a mixed solution based on sodium hydroxide; Filtration to obtain white filter cake calcium carbonate is washed and dried, pulverized and separated and weighed and packed to obtain calcium carbonate and 56.9 kilograms of calcium sulfide products respectively; the clarified filtrate...

Embodiment 2

[0023] Get 500 kilograms of pyrolysis ethylene waste caustic soda, wherein contain sodium sulfide 15% and sodium carbonate 4% etc.; Its preparation steps are:

[0024] 1) Heating the cracking ethylene waste lye to 40-50 degrees Celsius, wait for all the oil and soap to dissolve and float on the waste lye, then collect the oil and saponins to develop new products; cut out the waste lye for the next step deep processing;

[0025] 2) Add calcium hydroxide to the above-mentioned waste lye to react in a glass-lined reactor. The pure mass ratio of sodium sulfide and calcium hydroxide in the waste lye is 1: 0.95, and the agitator that starts makes the solution chemically Reaction; The reaction generates a mixed solution based on sodium hydroxide; Filtration to obtain the white filter cake calcium carbonate is washed and dried, pulverized and separated and weighed and packed to obtain calcium carbonate and 69.3 kilograms of calcium sulfide products respectively; the clarified filtrate...

Embodiment 3

[0028] Get 500 kilograms of pyrolysis ethylene waste caustic soda, wherein contain sodium sulfide 15% and sodium carbonate 4% etc.; Its preparation steps are:

[0029] 1) Heating the cracking ethylene waste lye to 40-50 degrees Celsius, wait for all the oil and soap to dissolve and float on the waste lye, then collect the oil and saponins to develop new products; cut out the waste lye for the next step deep processing;

[0030] 2) Add the above-mentioned waste lye to calcium hydroxide to react in the glass-lined reactor, the pure mass ratio of sodium sulfide and calcium hydroxide in the waste lye is 1: 1.15, and the agitator that starts makes the solution chemically Reaction; the reaction generates a mixed solution based on sodium hydroxide; the white filter cake calcium carbonate obtained by filtration is washed and dried, pulverized and separated and weighed and packaged to obtain calcium carbonate and 83.9 kilograms of calcium sulfide products respectively; the clarified fi...

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Abstract

The invention discloses a method for preparing caustic soda and coproducing calcium carbonate by using waste alkali liquid generated during ethylene cracking and relates to the technical field of comprehensive treatment and utilization of three wastes produced during ethylene cracking in petrochemical industry. The method comprises the steps of: heating waste alkali liquid generated during ethylene cracking, taking waste alkali liquid after all oil and soap are melted and float on the waste alkali solution; reacting the sodium sulfide in the obtained waste alkali liquid with calcium hydroxide in a glass lining reactor, starting a stirrer so that the solution has chemical reaction to produce mixture solution mainly containing sodium hydroxide; filtering to obtain a white calcium carbonate filter cake, washing and drying, crushing, separating and packaging to respectively obtain calcium carbonate and calcium sulfide products; sending the obtained clear sodium hydroxide alkali liquid in a normal-pressure evaporator, evaporating excessive moisture till the solution is in a saturated state, and then discharging, cooling into a block, and packaging to obtain a blocky caustic soda product. The method not only can lower the treatment cost of organic chemical industry and recycle waste material to create economic benefits, and but also can directly eliminate pollution sources.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of the three wastes produced by the ethylene cracking method of the organic petrochemical industry, in particular to a method for co-producing calcium carbonate with caustic soda prepared from the waste lye of the ethylene cracking method. Background technique [0002] The cracking method to produce ethylene is to use petroleum hydrocarbons as raw materials to crack the hydrocarbon molecules into a series of small molecular products such as hydrogen, ethylene and propylene through the high temperature process of the tower equipment, and the by-products of larger molecules formed by the further reaction of the primary products. These pyrolysis products can be obtained through physical separation and chemical refining process to obtain high-purity ethylene, propylene, butadiene, and aromatic hydrocarbon organic chemical basic raw materials such as benzene, toluene, and...

Claims

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Application Information

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IPC IPC(8): C01D1/20C01F11/18C01B17/42C02F9/10
Inventor 何侠
Owner 何侠
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