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 PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 16
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- 238000007670 refining Methods 0.000 title claims abstract description 9
- 239000004033 plastic Substances 0.000 claims abstract description 36
- 229920003023 plastic Polymers 0.000 claims abstract description 36
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 239000012634 fragment Substances 0.000 claims description 36
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 34
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 18
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 17
- 238000005406 washing Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
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- 239000013502 plastic waste Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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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
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℃。
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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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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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