CN107457936A - 一种新型pet回收工艺 - Google Patents

一种新型pet回收工艺 Download PDF

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CN107457936A
CN107457936A CN201610392508.XA CN201610392508A CN107457936A CN 107457936 A CN107457936 A CN 107457936A CN 201610392508 A CN201610392508 A CN 201610392508A CN 107457936 A CN107457936 A CN 107457936A
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pet
water
bottle
fragment
tetrahydrofuran
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邢士合
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Tianjin Fragrance Plastic Products Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
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    • C08J11/00—Recovery or working-up of waste materials
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    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B2017/001—Pretreating the materials before recovery
    • B29B2017/0015—Washing, rinsing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
    • B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

本发明公开的一种新型PET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

一种新型PET回收工艺
技术领域
本发明涉及塑料加工机械领域，特别是一种新型PET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塑料中混入的新型PET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30-60℃，搅拌2h，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55-70℃条件下烘干1h；
(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55-70℃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65-85℃。
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1h。
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80-120℃。
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30-60℃，搅拌2h，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55-70℃条件下烘干1h；
(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55-70℃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65-85℃，搅拌2h，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1h；
(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80-120℃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)

1.一种新型PET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30-60℃，搅拌2h，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55-70℃条件下烘干1h；
(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55-70℃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所述的一种新型PET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所述的一种新型PET回收工艺，其特征在于，步骤(9)中加热温度为65-85℃。
4.如权利要求2所述的一种新型PET回收工艺，其特征在于，步骤(10)中加热时间为1h。
5.如权利要求2所述的一种新型PET回收工艺，其特征在于，步骤(11)中加热温度为80-120℃。
CN201610392508.XA 2016-06-06 2016-06-06 一种新型pet回收工艺 Pending CN107457936A (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
CN114619587A (zh) * 2022-05-16 2022-06-14 河南源宏高分子新材料有限公司 一种pet材料的高效再生方法

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
CN114619587A (zh) * 2022-05-16 2022-06-14 河南源宏高分子新材料有限公司 一种pet材料的高效再生方法

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