5results about How to "Fast crystallization rate" patented technology

The present invention belongs to the technical field of chlorfenapyr production, and specifically provides a continuous device for chlorfenapyr crystallization, including a storage tank, the liquid outlet of the storage tank is connected to the liquid inlet of a falling film evaporator, the liquid outlet of the falling film evaporator is connected to a first temporary storage tank, the first temporary storage tank is connected to a condensation crystallizer, the condensation crystallizer is connected to a condensation crystallization kettle, the liquid outlet of the condensation crystallization kettle is connected to the liquid inlet at the top of a particle classification device, the particle classification device includes a shell, a third screen is fixedly arranged on the upper part of the shell, a third discharge port is arranged on the shell on the lower side of the third screen, a second screen is fixedly arranged on the middle part of the shell with a reverse tilt, the screen hole diameter of the second screen is small, a second discharge port is arranged on the shell on the lower side of the second screen, the second discharge port is connected to the condensation crystallization kettle through a pipeline, the third discharge port is connected to the centrifugal separator through a pipeline, and a collection box is arranged at the discharge port of the centrifugal separator. Through the above arrangement, the crystal particle size can be controlled.

The invention provides a nucleating agent as well as a preparation method and application thereof. The structure of the nucleating agent is shown as a formula I, the nucleating agent belongs to an organophosphate compound nucleating agent in an alpha nucleating agent, contains a benzene ring and a carbon-carbon triple bond, has relatively good thermal stability, and ensures that the nucleating agent is not molten, not decomposed and in a microparticle shape at a polymer melting point of EVOH in a subsequent application process of preparing the EVOH; meanwhile, the para-position and the carbon-carbon triple bond of the benzene ring are connected with polar groups, so that the whole nucleating agent shows polarity and can be uniformly dispersed in polar EVOH. Furthermore, a polar group in a carbon-carbon triple bond, namely, R1 contains a flexible rotatable functional group, so that the flexibility of the EVOH crystal substance can be improved. The EVOH with excellent comprehensive performance can be obtained by adding a small amount of EVOH into the EVOH.

The invention discloses thermoplastic polyvinyl alcohol resin as well as a preparation method and application thereof. The thermoplastic polyvinyl alcohol resin comprises polyvinyl alcohol resin, a nucleating agent, a flow modifier and a thermoplastic agent. The thermoplastic polyvinyl alcohol resin has the characteristics of ultrahigh fluidity, high crystallization rate, stable film forming process and the like, and can be well applied to the field of ultrathin film preparation, the prepared thermoplastic polyvinyl alcohol ultrathin film is transparent and has few defects, and the thickness of the film can be as low as 10 microns or below.

The invention relates to the technical field of catalyst production, and discloses an SCR catalyst raw powder Cu-SSZ-13 molecular sieve preparation method, which comprises: mixing a silicon source, an aluminum source, an alkali source, a template agent and water, and crystallizing to prepare a seed crystal; mixing a silicon source, an aluminum source, an alkali source, the copper ammonia complex and water to obtain a mixture; and mixing the mixture with a seed crystal to obtain slurry, crystallizing the slurry, and performing post-treatment to obtain the SCR catalyst raw powder Cu-SSZ-13 molecular sieve. The preparation method disclosed by the invention is simple, and the prepared catalyst raw powder is relatively low in cost, proper in silica-alumina ratio, high in copper dispersity and relatively high in hydrothermal stability under the promotion action of the seed crystal, and can be directly applied to NH3-SCR (Selective Catalytic Reduction) reaction.

The invention belongs to the technical field of membrane separation, and discloses a recycling and reusing method of waste synthetic liquid after MFI zeolite membrane reaction. The method comprises the following steps: collecting waste synthetic liquid after MFI zeolite membrane synthesis reaction, and removing possible large-particle impurities through simple physical separation means such as standing, centrifuging or filtering to obtain stable suspension rich in MFI crystals, and directly using the suspension as seed crystal liquid for next MFI membrane synthesis. According to the method, a complicated purification or retreatment process is not needed, and in-situ and all-component recovery of the waste synthetic liquid is realized. The method has the beneficial effects that the consumption of fresh seed crystals and chemical raw materials in the preparation process of the MFI film is greatly reduced, and the production cost is saved; meanwhile, the discharge of organic waste liquid is reduced, and the method is environment-friendly; the recycled seed crystal liquid is high in activity, when the seed crystal liquid is used for secondary synthesis, the prepared MFI membrane still has good continuity and separation performance, and an effective way is provided for achieving green, low-cost and sustainable manufacturing of the MFI membrane material.