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Method and device for decomposing waste material

A waste and compound technology, applied in the direction of bulk chemical production, recycling technology, hydrocarbon cracking and hydrocarbon production, etc., can solve practical problems and other problems

Inactive Publication Date: 2003-08-06
KOBE STEEL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the technology of JP-A-3-500264, as a detoxification method, it is important that the practicability of the substance obtained by the oxidation reaction is problematic. There is no mention of efficient waste decomposition methods and devices in chemical plants for polymers

Method used

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  • Method and device for decomposing waste material
  • Method and device for decomposing waste material
  • Method and device for decomposing waste material

Examples

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Embodiment 1

[0034] Use the device shown in Figure 1 to decompose and process by-product PET oligomers in chemical equipment for the manufacture of polyethylene terephthalate (PET) by the conditions shown in Table 1. Products resulting from the decomposition are terephthalic acid and ethylene glycol. The recoveries of terephthalic acid in each experiment are shown in Table 1 and figure 2 middle. In addition, the recovery rate is the weight % of the recovered terephthalic acid with respect to the weight of the terephthalic acid produced|generated theoretically from the weight of the PET oligomer charged. Such as figure 2 As shown, a recovery rate of 100% was obtained at 250° C. or higher under either pressure of 10 MPa or 30 MPa.

[0035] Experiment No.

[0036] * "Water addition ratio" is the weight of high-pressure and high-temperature water in the reactor / weight of waste.

Embodiment 2

[0038] Using the waste distillation residue from the chemical equipment used to synthesize toluene diisocyanate (TDI), an experiment was carried out to recover toluenediamine, an intermediate raw material of TDI. The experimental conditions are shown in Table 2. The composition of the distillation bottoms was 40% by weight of TDI, 20% by weight of dimers of TDI, and 40% by weight of trimers of TDI. The distillation residue at this time contains a large amount of TDI, the target compound, because it is difficult to separate the polymer and TDI by distillation. However, since TDI is also decomposed into toluene diamine, the resulting decomposed processed product (diamine compound) can be completely reused as an intermediate raw material in the isocyanate synthesis process.

[0039] The recoveries of toluenediamine in each experiment are shown in Table 2 and image 3 middle. The recovery is the weight percent of recovered toluenediamine relative to the theoretically calculated...

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Abstract

The present invention relates to a method for recovering monomer compound from waste and discarded material and its equipment. Said recovering method includes the following steps: feeding the waste and discarded material into reactor, then continuously adding the supercritical water or high temp. and high-pressure water with 100-400 deg.C and 5-40 MPa into the reactor to make the hydrolysable bond of the waste discarded material decompose and make the waste discarded material decompose so as to recover monomer compound. Said equipment includes reactor, supercritical water or high-pressure andhigh temp. water continuously-supplying device and device for feeding the decomposed waste discarded material into separator.

Description

[0001] The original application number of this divisional application is 97102903.2, and the filing date is January 20, 1997. The title of the invention is "Waste Decomposition Method and Device". technical field [0002] The present invention relates to a chemical plant that uses supercritical water or high-pressure high-temperature water to decompose waste containing by-products generated in chemical plants, and recovers and reuses raw material compounds or their derivatives, which are the target objects of the chemical plant, from the waste Method and device for decomposition of waste in China. Furthermore, it relates to a method and method for recovering their raw material compounds or their derivatives from the waste by using supercritical water or high-pressure high-temperature hydrolysis to treat wastes such as polyethylene terephthalate bottles and polyurethane foam plastics. device. Background technique [0003] When industrially synthesizing various chemicals in ...

Claims

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Application Information

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IPC IPC(8): C07C4/02C08J11/14
CPCY02P20/54Y02W30/62
Inventor 长濑佳之福里隆一
Owner KOBE STEEL LTD
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