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Recycling method for phosphorus in phosphorus-containing waste

A recycling and waste technology, applied in chemical instruments and methods, phosphorus compounds, phosphates, etc., can solve the problems of high cost, difficult industrial application, and no mention of inorganic phosphate reuse

Pending Publication Date: 2020-01-24
NANTONG CELLULOSE FIBERS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN103842301 A "Reducing Organic Phosphoric Acids" only mentions the method of reducing or removing organic phosphoric acid from the water flow, and does not mention the reuse of inorganic phosphates
The disadvantages are that the life of the integrated membrane is short, the cost is high, and the residue of the glyphosate mother liquor obtained after treatment is difficult to further process, and a large amount of fresh water is required and a large amount of dilute brine that needs to be further processed is produced at the same time, which is difficult for industrial application larger

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  • Recycling method for phosphorus in phosphorus-containing waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In the experiment, the industrial untreated acetic acid cracking method was used to prepare the process condensate produced by the acetic anhydride process. After ion chromatography analysis, the total phosphorus in the water was 1200mg / L, which contained 40% orthophosphorus and 60% organic phosphorus.

[0042] The above waste water is concentrated by an acid-resistant nanofiltration membrane concentration device, so that the total phosphorus content reaches 60,000 mg / L, and then cooled and crystallized at 35°C, filtered and washed to obtain an inorganic phosphate filter cake. The filtrate containing organophosphorus obtained by filtering is passed through O in the fixed bed reactor. 2 , at 400° C., reacted for 15 minutes under the action of a catalyst, wherein the organic phosphorus was converted into an inorganic phosphate mixture, and then returned to the aforementioned step (1) to continue to concentrate through the acid-resistant nanofiltration membrane. Dissolve, ...

Embodiment 2

[0044] In the experiment, the industrial untreated acetic acid cracking method was used to prepare the process condensate produced by the acetic anhydride process. According to ion chromatography analysis, the total phosphorus in the water was 1000mg / L, which contained 60% orthophosphorus and 40% organic phosphorus.

[0045] The above waste water is concentrated by a mechanical vapor recompression (MVR) evaporator, and the total phosphorus content reaches 80,000 mg / L. Then, it is cooled and crystallized at 30° C., press-filtered, and washed to obtain an inorganic phosphate filter cake. The organophosphorus-containing filtrate obtained by pressure filtration was added with H in a stirred tank reactor at 40°C 2 o 2, and reacted for 70 minutes under the action of a catalyst, wherein the organophosphorus was converted into a mixed solution of inorganic phosphate, and then returned to the aforementioned step (1) for concentration. The obtained inorganic phosphate is dissolved, fil...

Embodiment 3

[0047] In the experiment, the industrial untreated acetic acid cracking method was used to prepare the process condensate produced by the acetic anhydride process. After ion chromatography analysis, the total phosphorus in the water was 100mg / L, which contained 65% orthophosphorus and 35% organic phosphorus.

[0048] The above waste water is concentrated by a five-stage flash evaporation device, and the total phosphorus content reaches 60,000 mg / L. Then, it is cooled and crystallized at 15°C, centrifuged and washed to obtain an inorganic phosphate filter cake. The filtrate containing organophosphorus obtained by centrifugation is passed into air at 120°C in a tower reactor, and reacted for 120min under the action of a catalyst, wherein the organophosphorus is converted into an inorganic phosphate mixture, and then returns to the previous step (1 ) for concentration. The obtained inorganic phosphate is dissolved, filtered, recrystallized, washed to obtain a higher purity inorga...

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Abstract

The invention relates to a recycling method for phosphorus in phosphorus-containing waste. The phosphorus-containing waste comprises one or more organophosphorus compounds and inorganic phosphorus compounds. The method comprises the following steps: concentrating the phosphorus-containing waste, and effectively separating organophosphorus from inorganic phosphorus to obtain inorganic phosphate; purifying the obtained inorganic phosphate to obtain a high-purity phosphate product; preparing diammonium hydrogen phosphate with a purity meeting requirements by using the inorganic phosphate; and recycling the diammonium hydrogen phosphate as a catalyst for acetic acid cracking. According to the method, organophosphorus in high-phosphorus-content waste can be effectively converted into inorganicphosphorus; meanwhile, the phosphorus element in the waste is recycled, and the obtained inorganic phosphorus is purified to prepare high-purity inorganic phosphate, so the pollution emission of phosphorus resources is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical environmental protection, and relates to a method for resource utilization of phosphorus-containing waste produced in chemical production process, in particular to a method for resource utilization of phosphorus-containing waste produced in the production process of acetic anhydride prepared by acetic acid cracking method. Background technique [0002] In the process of acetic acid cracking to prepare acetic anhydride, inorganic phosphate is usually used as a catalyst, so phosphorus-containing waste will be produced in the high-temperature cracking production process. Based on the pressure of resources and environment, people began to study the technology of removing and recovering phosphorus from phosphorus-containing waste, and made some progress. [0003] Chinese patent CN103842301 A "Reducing Organic Phosphoric Acids" only mentions the method of reducing or removing organic phosphoric acid fr...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B25/26
CPCC01B25/30C01B25/265
Inventor 周峰于星姚俊杰顾海兵梁银春
Owner NANTONG CELLULOSE FIBERS CO LTD
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