A kind of method that reclaims precious metal platinum in tdi tar residue

A precious metal and residue technology, applied in the material field, can solve problems such as high operational risk, complex technology, and potential safety hazards, and achieve the effects of low environmental pollution risk, high digestion efficiency, and easy operation

Active Publication Date: 2020-12-25
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the preparation of TDI by phosgenation, phosgene is highly toxic and pollutes seriously; the process is long and the technology is complicated; the investment in production equipment is large, the hydrogen chloride produced is severely corrosive to the equipment, the production requirements are harsh, and the operation is dangerous. Security risks

Method used

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  • A kind of method that reclaims precious metal platinum in tdi tar residue

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033] The TDI tar residue solid raw material is mechanically ground into a TDI tar residue powder with a particle size of 80-200 mesh; weigh an appropriate amount of the ground TDI tar residue powder and place it in a high-temperature and high-pressure reactor with a stirring device. : 5~10 (mass:volume ratio, kilogram:liter) add methanol solvent, mix and stir evenly, obtain the solid-liquid mixture 1 containing TDI tar residue. The high-temperature and high-pressure reactor containing the solid-liquid mixture 1 is heated from room temperature to 230-250°C, the pressure is maintained at 4-5MPa, and the holding time is 15-120min for digestion reaction to obtain the digested solid-liquid mixture 2. Turn off the switch of the high temperature and high pressure reactor, depressurize and cool to normal temperature and pressure.

[0034] The solid-liquid separation of the digested solid-liquid mixture 2 is carried out to obtain the digested filtrate and the digested solid residue c...

Embodiment approach 2

[0037] The TDI tar residue solid raw material is mechanically ground into a TDI tar residue powder with a particle size of 80-200 mesh; weigh an appropriate amount of the ground TDI tar residue powder and place it in a high-temperature and high-pressure reactor with a stirring device. : 5~10 (mass:volume ratio, kilogram:liter) add ethanol solvent, mix and stir evenly, obtain the solid-liquid mixture 1 that contains TDI tar residue. The high-temperature and high-pressure reactor containing the solid-liquid mixture 1 is heated from room temperature to 240-260°C, the pressure is maintained at 4-6MPa, and the digestion time is 15-120min to carry out the digestion reaction to obtain the digested solid-liquid mixture 2. Turn off the switch of the high temperature and high pressure reactor, depressurize and cool to normal temperature and pressure.

[0038] The solid-liquid separation of the digested solid-liquid mixture 2 is carried out to obtain the digested filtrate and the digeste...

Embodiment approach 3

[0041] The TDI tar residue solid raw material is mechanically ground into a TDI tar residue powder with a particle size of 80-200 mesh; weigh an appropriate amount of the ground TDI tar residue powder and place it in a high-temperature and high-pressure reactor with a stirring device. :1~20 (mass:volume ratio, kilogram:liter) add isopropanol solvent, mix and stir evenly, obtain the solid-liquid mixture 1 containing TDI tar residue. The high-temperature and high-pressure reactor containing the solid-liquid mixture 1 is heated from room temperature to 240-260°C, the pressure is maintained at 2-12MPa, and the holding time is 15-120min to carry out the digestion reaction to obtain the digested solid-liquid mixture 2. Turn off the switch of the high temperature and high pressure reactor, depressurize and cool to normal temperature and pressure.

[0042] The solid-liquid separation of the digested solid-liquid mixture 2 is carried out to obtain the digested filtrate and the digested...

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Abstract

The invention belongs to the technical field of chemical recycling, and relates to a method used for recycling precious metal platinum in Toluene Dissocyanate (TDI) tar residues. The TDI tar residuescontaining a trace amount of the precious metal platinum are placed in a high-temperature and high-pressure reaction kettle, an appropriate amount of low-boiling-point polar solvent is added, and themixture is stirred to be uniform. Temperature, pressure and time are controlled to conduct digestion reaction, and a digestion solid-liquid mixture is obtained. Filtering is conducted, solid-liquid separation is conducted, and digestion filtrate and the rest of the residues containing the precious metal platinum are obtained. Digestion mixed liquor is used for standby application. Solid ash, obtained after the rest of the residues containing platinum is subjected to low-temperature ashing to remove deposited carbon, is added in acid solvent according to a certain solid-liquid ratio to be subjected to dissolving and leaching, and a leaching solution containing platinum complex ions is obtained. The platinum complex ions in the leaching solution are adsorbed through anion exchange resin, leaching elution is conducted, precipitate ammoniation is conducted, calcination is conducted, and a crude platinum product is obtained. The method is simple in process and easy and convenient to operate, conditions are easy to control, the environment pollution risk is small, tar residue resource, reduction and harmlessness recycling is facilitated, and the aims of economic benefits and environmentprotection are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical industry, and relates to a method for extracting chemical raw materials from residues of chemical products, in particular to a method for recovering precious metal platinum and other substances from methyl diisocyanate (TDI) tar residues. Background technique [0002] Toluene Dissocyanate (TDI) has two isomers, 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, and most of the commercial products are a mixture of the two isomers. In recent years, with the development of the polyurethane industry, the demand for TDI has also increased significantly, and the domestic growth rate has been 7% in recent years. According to the forecast of relevant units, the global consumption demand for TDI will grow at an annual rate of 4 in the next 10 years. % growth rate. Both the international and domestic TDI markets have great room for development. [0003] There are three production method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/00C22B11/00C07C29/78C07C31/08
CPCY02P10/20
Inventor 余根鼎李静玲龚凌诸杜逸兴陈友根陈荣国史荣会刘志鹏郑志功彭蕾倪柳芳
Owner FUJIAN UNIV OF TECH
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