CN107457937A - 一种pet废料精制回收工艺 - Google Patents

一种pet废料精制回收工艺 Download PDF

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CN107457937A
CN107457937A CN201610392949.XA CN201610392949A CN107457937A CN 107457937 A CN107457937 A CN 107457937A CN 201610392949 A CN201610392949 A CN 201610392949A CN 107457937 A CN107457937 A CN 107457937A
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pet
water
bottle
fragment
tetrahydrofuran
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邢椿铧
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Tianjin Kanghua Paper Plastic Package Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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    • C08J11/08Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02Separating plastics from other materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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    • B29B2017/001Pretreating the materials before recovery
    • B29B2017/0015Washing, rinsing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00Recovery of plastics or other constituents of waste material containing plastics
    • B29B2017/0089Recycling systems, wherein the flow of products between producers, sellers and consumers includes at least a recycling step, e.g. the products being fed back to the sellers or to the producers for recycling purposes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02Separating plastics from other materials
    • B29B2017/0203Separating plastics from plastics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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    • C08J2327/00Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
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    • C08J2327/04Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

本发明公开的一种PET废料精制回收工艺,利用PET与PVC在特定溶剂中溶解度不同的特性,通过在特定溶剂的作用下溶解杂质PVC,烘干滤渣即可得到纯品PET塑料。有效提高了PET塑料的纯度同时可以副产较高纯度的回收PVC塑料。

Description

一种PET废料精制回收工艺
技术领域
本发明涉及塑料加工机械领域,特别是一种PET废料精制回收工艺。
背景技术
塑料是采用塑料为主要原料加工而成的生活用品、工业用品的统称。由于塑料的大量生产、消费与较短的使用周期使得塑料废弃物的数量急剧增加。塑料的大量废弃不仅造成资源的巨大浪费,也给环境带来极大危害:污染土壤和海洋、焚烧处理产生大量有物质。在能源问题日益突出、环境问题日益严峻的新形势下,加强废旧塑料回收利用的研究引起了各国政府的高度重视。废旧塑料的回收包括三个阶段:收集、分选以及循环利用,现阶段制约废旧塑料回收的瓶颈环节在于塑料的分选。
发明内容
本发明所要解决的技术问题是提供一种能够分离回收PET塑料中混入的PET废料精致回收工艺。
本发明具体技术方案步骤如下:
(1)上料:将回收的PET瓶投入到输送带上,在上料的过程中去除打包带和废铁丝;
(2)筛选:将步骤(1)中输送过来的PET瓶在筛选区中去除塑片、PVC瓶、标签、PE瓶盖、石子杂质,只留下白色PET瓶;
(3)湿式粉碎:将步骤(2)中筛选后的白色PET瓶投入到湿式粉碎机中,将PET瓶破碎成不同尺寸的塑料碎片,废水输送到水处理系统中;
(4)重力漂洗:从步骤(3)中出来的PET塑料碎片夹杂着瓶盖被输送到一个清洗桶中,向清洗桶中注入清水,在水的浮力作用下,瓶盖的密度比PET塑料碎片的密度小,瓶盖漂浮在水面,然后将漂浮在水面上的瓶盖打捞出去,将瓶盖与PET塑料碎片分离,产生的废水输送到水处理系统中;
(5)热碱清洗:向步骤(4)中的清洗桶中投入片碱,然后加热清洗,除去塑料碎片的油污和灰尘;
(6)水冲洗:用水冲洗经过步骤(5)的PET塑料碎片;
(7)离心脱水:将经过步骤(6)的PET塑料碎片投入到离心脱水机中,在脱水机的作用下脱水,去除PET塑料碎片上的水污;
(8)漂洗:将步骤(7)中脱水后的塑料碎片输送上去,然后投入到漂洗装置中,进行漂洗,彻底除去粘在塑料碎片上黏贴标签的胶水;
(9)提纯:将步骤(8)中经过漂洗后的PET塑料碎片投入到装有四氢呋喃的搅拌釜中,加热到50-90℃,搅拌2.5h,将PET碎片中含有的PVC杂质溶解到四氢呋喃中;
(10)过滤:步骤(9)中提纯后的PET碎片经压滤机过滤后,投入到烘干机中在60-90℃条件下烘干1.5h;
(11)蒸馏:将步骤(9)中清洗过PET塑料碎片的四氢呋喃引入蒸馏釜中,在65-95℃条件下蒸馏,馏出分为四氢呋喃,在步骤(9)中重复利用,釜残物为较高纯度的PVC塑料;
(12)包装:步骤(10)中烘干后的PET塑料碎颗粒片及步骤(11)中得到的PVC塑料分别输送到包装袋中进行包装。
进一步的,步骤(9)中四氢呋喃由二甲苯替代。
进一步的,步骤(9)中四氢呋喃由二甲苯替代后,步骤(9)中加热温度为60-90℃。
进一步的,步骤(9)中四氢呋喃由二甲苯替代后,步骤(10)中加热时间为2h。
进一步的,步骤(9)中四氢呋喃由二甲苯替代后,步骤(11)中加热温度为70-110℃。
本发明的有益效果在于提供了一种可以方便高效分离回收PET塑料中的PVC塑料的设备。有效提高了回收PET塑料的纯度,降低了PVC杂质对PET性质的影响。同时副产出PVC塑料,提高了经济效益。
具体实施方式
下面结合实施例对本发明的具体实施方式作进一步描述,以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
实施例1
本发明具体技术方案步骤如下:
(1)上料:将回收的PET瓶投入到输送带上,在上料的过程中去除打包带和废铁丝;
(2)筛选:将步骤(1)中输送过来的PET瓶在筛选区中去除塑片、PVC瓶、标签、PE瓶盖、石子杂质,只留下白色PET瓶;
(3)湿式粉碎:将步骤(2)中筛选后的白色PET瓶投入到湿式粉碎机中,将PET瓶破碎成不同尺寸的塑料碎片,废水输送到水处理系统中;
(4)重力漂洗:从步骤(3)中出来的PET塑料碎片夹杂着瓶盖被输送到一个清洗桶中,向清洗桶中注入清水,在水的浮力作用下,瓶盖的密度比PET塑料碎片的密度小,瓶盖漂浮在水面,然后将漂浮在水面上的瓶盖打捞出去,将瓶盖与PET塑料碎片分离,产生的废水输送到水处理系统中;
(5)热碱清洗:向步骤(4)中的清洗桶中投入片碱,然后加热清洗,除去塑料碎片的油污和灰尘;
(6)水冲洗:用水冲洗经过步骤(5)的PET塑料碎片;
(7)离心脱水:将经过步骤(6)的PET塑料碎片投入到离心脱水机中,在脱水机的作用下脱水,去除PET塑料碎片上的水污;
(8)漂洗:将步骤(7)中脱水后的塑料碎片输送上去,然后投入到漂洗装置中,进行漂洗,彻底除去粘在塑料碎片上黏贴标签的胶水;
(9)提纯:将步骤(8)中经过漂洗后的PET塑料碎片投入到装有四氢呋喃的搅拌釜中,加热到50-90℃,搅拌2.5h,将PET碎片中含有的PVC杂质溶解到四氢呋喃中;
(10)过滤:步骤(9)中提纯后的PET碎片经压滤机过滤后,投入到烘干机中在60-90℃条件下烘干1.5h;
(11)蒸馏:将步骤(9)中清洗过PET塑料碎片的四氢呋喃引入蒸馏釜中,在65-95℃条件下蒸馏,馏出分为四氢呋喃,在步骤(9)中重复利用,釜残物为较高纯度的PVC塑料;
(12)包装:步骤(10)中烘干后的PET塑料碎颗粒片及步骤(11)中得到的PVC塑料分别输送到包装袋中进行包装。
实施例2
本发明具体技术方案步骤如下:
(1)上料:将回收的PET瓶投入到输送带上,在上料的过程中去除打包带和废铁丝;
(2)筛选:将步骤(1)中输送过来的PET瓶在筛选区中去除塑片、PVC瓶、标签、PE瓶盖、石子杂质,只留下白色PET瓶;
(3)湿式粉碎:将步骤(2)中筛选后的白色PET瓶投入到湿式粉碎机中,将PET瓶破碎成不同尺寸的塑料碎片,废水输送到水处理系统中;
(4)重力漂洗:从步骤(3)中出来的PET塑料碎片夹杂着瓶盖被输送到一个清洗桶中,向清洗桶中注入清水,在水的浮力作用下,瓶盖的密度比PET塑料碎片的密度小,瓶盖漂浮在水面,然后将漂浮在水面上的瓶盖打捞出去,将瓶盖与PET塑料碎片分离,产生的废水输送到水处理系统中;
(5)热碱清洗:向步骤(4)中的清洗桶中投入片碱,然后加热清洗,除去塑料碎片的油污和灰尘;
(6)水冲洗:用水冲洗经过步骤(5)的PET塑料碎片;
(7)离心脱水:将经过步骤(6)的PET塑料碎片投入到离心脱水机中,在脱水机的作用下脱水,去除PET塑料碎片上的水污;
(8)漂洗:将步骤(7)中脱水后的塑料碎片输送上去,然后投入到漂洗装置
(9)提纯:将步骤(8)中经过漂洗后的PET塑料碎片投入到装有二甲苯的搅拌釜中,加热到60-90℃,搅拌1h,将PET碎片中含有的PVC杂质溶解到二甲苯中;
(10)过滤:步骤(9)中提纯后的PET碎片经压滤机过滤后,投入到烘干机中在65-70℃条件下烘干2h;
(11)蒸馏:将步骤(9)中清洗过PET塑料碎片的二甲苯引入蒸馏釜中,在70-110℃条件下蒸馏,馏出分为二甲苯,在步骤(9)中重复利用,釜残物为较高纯度的PVC塑料;
(12)包装:步骤(10)中烘干后的PET塑料碎颗粒片及步骤(11)中得到的PVC塑料分别输送到包装袋中进行包装。
以上对本发明的一个实施例进行了详细说明,但所述内容仅为本发明的较佳实施例,不能被认为用于限定本发明的实施范围。凡依本发明申请范围所作的均等变化与改进等,均应仍归属于本发明的专利涵盖范围之内。

Claims (5)

1.一种PET废料精制回收工艺,其特征在于,本发明具体技术方案步骤如下:
(1)上料:将回收的PET瓶投入到输送带上,在上料的过程中去除打包带和废铁丝;
(2)筛选:将步骤(1)中输送过来的PET瓶在筛选区中去除塑片、PVC瓶、标签、PE瓶盖、石子杂质,只留下白色PET瓶;
(3)湿式粉碎:将步骤(2)中筛选后的白色PET瓶投入到湿式粉碎机中,将PET瓶破碎成不同尺寸的塑料碎片,废水输送到水处理系统中;
(4)重力漂洗:从步骤(3)中出来的PET塑料碎片夹杂着瓶盖被输送到一个清洗桶中,向清洗桶中注入清水,在水的浮力作用下,瓶盖的密度比PET塑料碎片的密度小,瓶盖漂浮在水面,然后将漂浮在水面上的瓶盖打捞出去,将瓶盖与PET塑料碎片分离,产生的废水输送到水处理系统中;
(5)热碱清洗:向步骤(4)中的清洗桶中投入片碱,然后加热清洗,除去塑料碎片的油污和灰尘;
(6)水冲洗:用水冲洗经过步骤(5)的PET塑料碎片;
(7)离心脱水:将经过步骤(6)的PET塑料碎片投入到离心脱水机中,在脱水机的作用下脱水,去除PET塑料碎片上的水污;
(8)漂洗:将步骤(7)中脱水后的塑料碎片输送上去,然后投入到漂洗装置中,进行漂洗,彻底除去粘在塑料碎片上黏贴标签的胶水;
(9)提纯:将步骤(8)中经过漂洗后的PET塑料碎片投入到装有四氢呋喃的搅拌釜中,加热到50-90℃,搅拌2.5h,将PET碎片中含有的PVC杂质溶解到四氢呋喃中;
(10)过滤:步骤(9)中提纯后的PET碎片经压滤机过滤后,投入到烘干机中在60-90℃条件下烘干1.5h;
(11)蒸馏:将步骤(9)中清洗过PET塑料碎片的四氢呋喃引入蒸馏釜中,在65-95℃条件下蒸馏,馏出分为四氢呋喃,在步骤(9)中重复利用,釜残物为较高纯度的PVC塑料;
(12)包装:步骤(10)中烘干后的PET塑料碎颗粒片及步骤(11)中得到的PVC塑料分别输送到包装袋中进行包装。
2.如权利要求1所述的一种PET废料精制回收工艺,其特征在于,步骤(9)中四氢呋喃由二甲苯替代。
3.如权利要求2所述的一种PET废料精制回收工艺,其特征在于,步骤(9)中加热温度为60-90℃。
4.如权利要求2所述的一种PET废料精制回收工艺,其特征在于,步骤(10)中加热时间为2h。
5.如权利要求2所述的一种PET废料精制回收工艺,其特征在于,步骤(11)中加热温度为70-110℃。
CN201610392949.XA 2016-06-06 2016-06-06 一种pet废料精制回收工艺 Pending CN107457937A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113954269A (zh) * 2020-07-20 2022-01-21 湖南耐力科技有限公司 一种塑料边角料的回收工艺
CN114941186A (zh) * 2022-07-01 2022-08-26 广东安拓普聚合物科技有限公司 一种基于pet的抗菌耐磨纤维及其制备方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113954269A (zh) * 2020-07-20 2022-01-21 湖南耐力科技有限公司 一种塑料边角料的回收工艺
CN114941186A (zh) * 2022-07-01 2022-08-26 广东安拓普聚合物科技有限公司 一种基于pet的抗菌耐磨纤维及其制备方法

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