Production system for removing VOC (Volatile Organic Compounds) from polyether polyol
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A polyether polyol and production system technology, applied in flash evaporation, vacuum distillation, steam distillation, etc., can solve the problems of limited removal effect and long operation cycle, and achieve the effect of low gas volume and strong process adaptability
Pending Publication Date: 2021-08-31
ANHUI SHIHUA ENG & TECH
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: how to solve the existing problems such as limited removal effect, long operation cycle, and difficulty in removal in the existing method for removing VOC from polyether polyols, and provides a method for removing VOCs from polyether polyols. VOC-free production system
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Embodiment 1
[0020] A production system for removing VOC from polyether polyols, including a stripping tower, a flash tower, an outgoing pump, and a vacuum unit;
[0021] The stripper comprises three parts, a deceleration section, a stripping section and a tower still section. An external jacket or an external heat tracing pipe is provided, and 0.1-1.0 MPa (G) saturated steam is used for heat tracing. In this embodiment, 0.2-0.5 MPa (G) saturated steam is preferably used.
[0022] The diameter ratio of the deceleration section and the stripping section is 1.2:1 to 2:1. The deceleration section is used to reduce the superficial gas velocity, reduce mist entrainment, and increase product yield. The diameter ratio is selected according to the size of the mist droplet to ensure that the degassed phase leaves the tower body, while the polyether polyol product remains In the tower, product loss is reduced.
[0023] In this embodiment, the demister section of the stripping tower includes a demi...
Embodiment 2
[0059] like figure 1 As shown, a production system for removing VOC from polyether polyols includes a stripper C-101, a flash tower C-102, an external delivery pump P-101, and a vacuum unit P-102.
[0060] There are three sections in the stripping tower, which are deceleration section 1-I, stripping section 1-II, and tower kettle section 1-III, and include at least four material ports, at least one pressure control loop 11 and one Liquid level control circuit 16.
[0061] According to requirements, a pre-stripping polyether inlet 18 and a gas phase outlet 17 are arranged at the top of the stripper, and a polyether outlet 19 and a stripping gas inlet 110 are arranged at the bottom.
[0062] The stripping polyether enters the stripping tower from the top of the tower, and the stripping gas enters the stripping tower from the bottom of the tower, and contacts in countercurrent in the tower to remove small molecular substances containing odor. The polyether flows out from the bo...
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Abstract
The invention discloses a production system for removing VOC (volatile organic compounds) from polyether polyol, and belongs to the technical field of polyether polyol production. The production system comprises a stripping tower, a flash tower, a delivery pump and a vacuum unit, the stripping tower comprises a deceleration section, a stripping section and a first tower kettle section which are sequentially arranged from top to bottom. The flash tower comprises a separation section, a flash section and a second tower kettle section which are sequentially arranged from top to bottom, and the top of the stripping tower is provided with a pre-removal polyether inlet and a gas phase outlet. The method is high in adaptability to the existing production process of the polyether polyol, and other transformation is not needed; continuous production is achieved, and more energy conservation and high efficiency are achieved; other impurities are not introduced into the product, and a complicated subsequent treatment process is not needed; and the removed VOC exists in the form of waste gas, the gas amount is low, the method can be suitable for various existing waste gas treatment processes, the process adaptability of three-waste treatment is high, and the method is worthy of being popularized and used.
Description
technical field [0001] The invention relates to the technical field of polyether polyol production, in particular to a production system for removing VOC from polyether polyol. Background technique [0002] Polyether polyols are important raw materials for the polyurethane industry. Polyurethane products are used in a wide range of fields, from interior parts such as automobiles, trains, ships, and airplanes to mattresses, sofas, chairs, bedding, carpets, building energy-saving insulation materials, sealing materials, and waterproof materials. Polyurethane products are used for home appliances such as refrigerator insulation materials, electrical casings, insulating devices, and packaging. Synthetic fibers, that is, spandex, can be used to manufacture high-end sportswear and diving suits. [0003] With the strengthening of environmental protection awareness and the improvement of living standards, the environmental protection requirements for daily necessities are becoming ...
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Application Information
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