CN1374296A - Production process of caprolactam with waste nylon 6 - Google Patents

Production process of caprolactam with waste nylon 6 Download PDF

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Publication number
CN1374296A
CN1374296A CN01106318A CN01106318A CN1374296A CN 1374296 A CN1374296 A CN 1374296A CN 01106318 A CN01106318 A CN 01106318A CN 01106318 A CN01106318 A CN 01106318A CN 1374296 A CN1374296 A CN 1374296A
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CN
China
Prior art keywords
caprolactam
waste
sent
nylon
fed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN01106318A
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Chinese (zh)
Inventor
李智范
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN01106318A priority Critical patent/CN1374296A/en
Publication of CN1374296A publication Critical patent/CN1374296A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The present invention features that waste nylon-6 is fed continuously by a screw feeder into one depolymerizing reactor to depolymerize at 280-300 deg.c while caustic soda as catalyst in 0.3-0.5 % is fed. Gaseous caprolactam is produced continuously in the reactor and fed into a cooler to cool into liquid caprolactam, and the liquid caprolactam is crystallized in a crystallizer to form solid grians, which are further water washed, dewatered and stoved to become the product. The present invention provides one new way to utilize waste nylon and the said process is simple and has high caprolactam yield and purity.

Description

Method with waste and old nylon 6 production caprolactams
The present invention relates to the regeneration of waste and old nylon.
Regeneration to waste and old nylon mainly is to make fragmental injection moulding and wire drawing nylon regenerative raw materials by physical process such as fragmentation, cleaning, dryings at present.Do not see as yet that through consulting pertinent data and patent documentation inspection the record of waste and old nylon being produced caprolactam by chemical process is arranged.
The purpose of this invention is to provide the method that the waste and old nylon of a kind of usefulness is produced hexanolactam.
Technical solution of the present invention is: it is depolymerization in the 280-300 ℃ of depolymerization still that waste and old nylon 6 is sent into temperature continuously through the screw rod feeding machine, the caustic soda catalyzer that adds 0.3-0.5% simultaneously with the screw rod feeding machine, hexanolactam was gaseous state and generated in the depolymerization still continuously this moment, again the gaseous state caprolactam is sent into water cooler and be cooled to liquid caprolactam, again liquid caprolactam is sent into crystallizer and crystallizes into solid particulate, again with solid particulate through the washing, the dehydration and the oven dry.
Effect of the present invention is: the new way that it provides waste and old nylon chemical regeneration to utilize, its production method have that technology is simple, hexanolactam productive rate and the high characteristics of purity.
Embodiment: it is depolymerization in the 280-300 ℃ of depolymerization still that waste and old nylon 6 is sent into temperature continuously through the screw rod feeding machine, the caustic soda catalyzer that adds 0.3-0.5% simultaneously with the screw rod feeding machine, hexanolactam was gaseous state and generated in the depolymerization still continuously this moment, again the gaseous state caprolactam is sent into water cooler and be cooled to liquid caprolactam, again liquid caprolactam is sent into crystallizer and crystallizes into solid particulate, again with solid particulate through the washing, the dehydration and the oven dry.

Claims (1)

1, the method for producing caprolactam with waste and old nylon 6, it is characterized in that it is depolymerization in the 280-300 ℃ of depolymerization still that waste and old nylon 6 is sent into temperature continuously through the screw rod feeding machine, the caustic soda catalyzer that adds 0.3-0.5% simultaneously with the screw rod feeding machine, hexanolactam was gaseous state and generated in the depolymerization still continuously this moment, again the gaseous state caprolactam is sent into water cooler and be cooled to liquid caprolactam, again liquid caprolactam is sent into crystallizer and crystallizes into solid particulate, again with solid particulate through the washing, the dehydration and the oven dry.
CN01106318A 2001-03-14 2001-03-14 Production process of caprolactam with waste nylon 6 Pending CN1374296A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN01106318A CN1374296A (en) 2001-03-14 2001-03-14 Production process of caprolactam with waste nylon 6

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN01106318A CN1374296A (en) 2001-03-14 2001-03-14 Production process of caprolactam with waste nylon 6

Publications (1)

Publication Number Publication Date
CN1374296A true CN1374296A (en) 2002-10-16

Family

ID=4655346

Family Applications (1)

Application Number Title Priority Date Filing Date
CN01106318A Pending CN1374296A (en) 2001-03-14 2001-03-14 Production process of caprolactam with waste nylon 6

Country Status (1)

Country Link
CN (1) CN1374296A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101423623B (en) * 2007-11-02 2011-05-11 宁波大学 Depolymerization and recovery method of high temperature resistant nylon poly-para-phenylene diformyl hexane diamine
CN104761497A (en) * 2015-04-25 2015-07-08 哈尔滨工业大学 Subcritical catalytic hydrolysis MC nylon method for preparing caprolactam

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101423623B (en) * 2007-11-02 2011-05-11 宁波大学 Depolymerization and recovery method of high temperature resistant nylon poly-para-phenylene diformyl hexane diamine
CN104761497A (en) * 2015-04-25 2015-07-08 哈尔滨工业大学 Subcritical catalytic hydrolysis MC nylon method for preparing caprolactam

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C06 Publication
PB01 Publication
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication