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可降解塑料PBAT厂商直接连续酯化法是怎么操作的?

可降解塑料PBAT厂商直接连续酯化法是怎么操作的?

来源网址:https://www.swjjkl.com/ 2022-04-06 14:47:00    

可降解塑料PBAT直接连续酯化法是一种能提升产品质量和生产效率的生产方法,对于它是怎么操作的,相信是不少朋友都想了解的。下面,我们就可以跟着小编来一起了解一下可降解塑料PBAT直接连续酯化法是怎么操作的。

Direct continuous esterification of degradable plastic PBAT is a production method that can improve product quality and production efficiency. I believe many friends want to know how it operates. Next, we can follow Xiaobian to understand how the direct continuous esterification of degradable plastic PBAT operates.
(1)为了减少BDO副反应,减少THF生成,减少原料消耗,整个酯化反应在真空条件下进行,降低了酯化反应温度;同时,能耗也降低了。
(1) In order to reduce the side reaction of BDO, the formation of THF and the consumption of raw materials, the whole esterification reaction was carried out under vacuum and the esterification temperature was reduced; At the same time, energy consumption is also reduced.
(2)由于原料性低,采用高性能催化剂;由于催化剂易水解失活,将传统的液位以上添加催化剂的方式改为液位以下添加催化剂,解决了上述问题。
(2) Due to the low raw material property, high-performance catalyst is adopted; Because the catalyst is easy to be hydrolyzed and inactivated, the traditional method of adding catalyst above the liquid level is changed to adding catalyst below the liquid level, which solves the above problems.
(3)缩聚过程中,生成的低聚物容易随真空气体管道带入喷淋系统,造成系统堵塞。因此,在气相管道上设置旋风分离收集系统,生成的低聚物由旋风分离器收集捕集,尾气进入BDO喷淋循环系统。
(3) In the polycondensation process, the oligomer generated is easy to be brought into the spray system with the vacuum gas pipeline, resulting in system blockage. Therefore, a cyclone separation and collection system is set on the gas phase pipeline, the generated oligomers are collected and collected by the cyclone separator, and the tail gas enters the BDO spray circulation system.
(4)酯化过程中,虽然可以降低副反应的程度,但无法避免;酯化废水的主要成分是THF和水。THF毒性低,但其高浓度容易对人体造成伤害。如果直接排入污水处理,会对污水处理系统造成危害。因此,建立了一个THF回收装置来分离THF和水。经回收装置处理后,THF质量分数可达99.95%以上,可直接销售;废水中THF的质量分数控制在0.05%左右。同时,这部分废水被送到废水汽提塔进行汽提,从中提取THF,然后通过管道送到燃气锅炉燃烧。
(4) In the esterification process, although the degree of side reaction can be reduced, it can not be avoided; The main components of esterification wastewater are THF and water. THF has low toxicity, but its high concentration is easy to cause harm to human body. If it is directly discharged into the sewage treatment system, it will cause harm to the sewage treatment system. Therefore, a THF recovery unit was established to separate THF and water. After treatment by the recovery unit, the THF mass fraction can reach more than 99.95%, which can be sold directly; The mass fraction of THF in wastewater is controlled at about 0.05%. At the same time, this part of wastewater is sent to the Wastewater Stripper for stripping, from which THF is extracted, and then sent to the gas-fired boiler for combustion through the pipeline.
(5)由于PBAT的玻璃化转变温度低,如果采用传统的水下罗纹造粒,容易造成粘刀和缠刀,导致生产不稳定。因此,切片颗粒的成型和结晶程度可以通过水下输送管道的长度和造粒水的温度来控制。同时,由于PBAT易于降解,产生的切片颗粒被输送到干燥塔进行干燥,然后用氮气冲洗进行保护和包装。
(5) Due to the low glass transition temperature of PBAT, if the traditional underwater rib granulation is adopted, it is easy to cause knife sticking and knife wrapping, resulting in unstable production. Therefore, the molding and crystallization degree of sliced particles can be controlled by the length of underwater transmission pipeline and the temperature of granulation water. At the same time, due to the easy degradation of PBAT, the sliced particles are transported to the drying tower for drying, and then washed with nitrogen for protection and packaging.
(6)针对PBAT分子链增长困难、粘度高、流动性差的特点,可将物料的动态粘度从目前的350 pa·S提高到1000 pa·S以上,分子链也会相应增加;同时,由于粘度高,需要螺杆出料来保证生产的稳定性。
(6) In view of the characteristics of difficult growth, high viscosity and poor fluidity of PBAT molecular chain, the dynamic viscosity of the material can be increased from 350 PA · s to more than 1000 PA · s, and the molecular chain will increase accordingly; At the same time, due to high viscosity, screw discharge is required to ensure the stability of production.
(7)由于PBAT生产过程中产生THF蒸汽,在缩聚装置局部安装轴流风机,增强装置的通风能力,并安装可燃和有害气体检测报警装置,现场设计个人防护口罩和呼吸器等设备;THF回收装置采用全开放式混凝土框架结构,有害气体不易积聚。
(7) As THF steam is generated in the production process of PBAT, axial flow fans are installed locally in the polycondensation unit to enhance the ventilation capacity of the unit, combustible and harmful gas detection and alarm devices are installed, and personal protective masks, respirators and other equipment are designed on site; THF recovery unit adopts fully open concrete frame structure, and harmful gas is not easy to accumulate.
以上就是为大家介绍的有关生物降解颗粒的详细介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以的态度,为您提供服务https://www.swjjkl.com
The above is the detailed introduction of biodegradable particles. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service https://www.swjjkl.com