41results about How to "Shorten the crystallization cycle" patented technology

The invention discloses a continuous crystallization device of trichlorphon raw medicine, and a method thereof. The device comprises a steel belt, a transmission roller and a cooling device, wherein a material distributer is arranged above the material conveying end of the steel belt, and communicates with a feeding pipe; the outer periphery of the feeding pipe is provided with a heat tracing device; a cooling device is arranged under the middle part of the steel belt; the discharging end of the steel belt is provided with a discharging device; the discharging end of the steel belt is connected with a crushing machine. The method of the trichlorphon raw medicine continuous crystallization by using the device comprises the following steps that (1) the trichlorphon raw medicine is fed into the feeding pipe, is heated by the heat tracing device, then flows into the material distributor, and uniformly and downwards drips and falls through the material distributor; (2) the trichlorphon raw medicine liquid is uniformly spread on the steel belt, and then, the steel belt transmission is stopped; (3) the steel belt is cooled through the cooling device arranged under the steel belt; (4) after the trichlorphon raw medicine is crystallized into trichlorphon crystals, the transmission roller is started; the discharging device discharges the trichlorphon crystals into the crushing machine. The method has the advantages that simplicity is realized; the operation is easy; the crystallization period is short; the quality of the trichlorphon raw medicine crystals is good.

The invention relates to a preparation method of a ZSM-5 molecular sieve. The method comprises performing solid-phase thermal crystallization of a ZSM-5 molecular sieve precursor to obtain a sodium-type ZSM-5 molecular sieve. The preparation method of the ZSM-5 molecular sieve is high in reaction speed and short in crystallization time, is high in single-reactor yield and production efficiency, and is not limited by silicon-aluminum sources. According to the invention, the prepared ZSM-5 molecular sieve has advantages of nanoscale, high crystallization degree, and excellent physical and chemical performance.

The invention discloses a bio-based polyester composition which mainly consists of a bio-based polyester and an organic nucleating agent in parts by weight, wherein the organic nucleating agent is at least one of compounds with the chemical structural formula as shown in the specification, and R1, R2, R3 and R4 are respectively and independently selected from alkyl or alkyl containing substituent groups. The bio-based polyester composition prepared by the preparation method provided by the invention has the characteristics of high crystallization temperature, high crystallization speed, short semi-crystallization time and the like, the molding cycle can be obviously shortened, the molding efficiency is improved, and the preparation method is simple and environment-friendly and is easy for realization industrialization.

The invention relates to a method for preparing psicose crystals. The present invention adopts the combination of evaporation crystallization method and cooling crystallization method to prepare allulose crystals, the preparation process is simple, easy to operate, and the crystallization period is short. In the present invention, during the evaporation crystallization process, the seed crystals are added at a lower solid content (70-75%), which is beneficial to the crystallization process, and the crystal growth rate in all directions is more uniform, which can shorten the entire crystallization period and save energy. Consumption; crystallization is carried out after evaporation and crystallization. The crystallization makes the crystal size tend to be averaged, and at the same time the crystal surface grows to be smooth, and the crystal shape is improved; after the crystallization, cooling crystallization is carried out. Zone curve, design the cooling frequency of different cooling intervals. According to the preparation method of the present invention, after the crystallization is completed, the yield of the obtained crystals is high, the crystal size distribution is concentrated, and the crystal surface is smooth and mirror-like, with good light reflection and regular crystal forms.

The invention discloses a method for synthesizing a beta molecular sieve by utilizing a beta molecular sieve mother solution. The method comprises the following steps: performing equal-pH coprecipitation on a crystallized mother solution and dilute acid parallel flow to synthesize silica gel in bottom water containing a gel accelerator, adding a template-agent-containing BETA molecular sieve milled by a colloid mill to serve as a seed crystal, and performing hydrothermal crystallization to synthesize the BETA molecular sieve according to the ratio of low addition amount of organic template agents. According to the production method disclosed by the invention, the batching amount of a fresh silicon source and the template agent in beta molecular sieve synthesis is reduced, and due to the existence of a molecular sieve microcrystal, the crystallization process of the molecular sieve is accelerated, and the crystallization period is shortened. Moreover, the synthesized beta molecular sieve is high in crystallinity degree, the milled seed crystal contains lots of micro grains and organic template agents with secondary structures, the crystallization induction period can be effectively shortened, and the use amount of the template agent is reduced. Therefore, the synthetic cost is greatly reduced.

The invention discloses a method for preparing a zeolite molecular sieve through quick crystallization of dry glue, and relates to the field of molecular sieve solid phase synthesis. The method specifically comprises the following steps: adding an aluminum source and a fluoride into a silicon-aluminum type molecular sieve mother solution for crystallizing to obtain a silicon-aluminum type molecular sieve guiding agent; adding an alkali source, a silicon source, a template agent R and deionized water into the silicon-aluminum type molecular sieve guiding agent, uniformly carrying out mixing, and then carrying out drying to obtain dry glue powder; and crystallizing the dry glue powder in a steam atmosphere in a continuous crystallization kettle to obtain the zeolite molecular sieve, whereinthe crystallization time is 2-10 hours. The guiding agent disclosed by the invention is obtained by secondary crystallization, and is high in activity and strong in guiding action, so that the usage amount of the template agent can be reduced, crystallinity can be improved, generation of hybrid crystal phases formed by solid-phase synthesis is avoided, and the crystallization period is shortened.The continuous crystallization kettle can be used for continuous production without need of cooling and pressure relief, so that the required crystallization time is short, and efficiency and yield are high. The prepared zeolite molecular sieve is good in stability, high in crystallinity and high in silicon-aluminum ratio.

The invention introduces a preparation method of modified HEU type zeolite and an application of the modified HEU type zeolite as a nitrogen selection adsorbent. The preparation method comprises the following steps of uniformly mixing SiO2 with Al2O3, Na2O, K2O and H2O according to the mole ratio of the SiO2 to the Al2O3, to the Na2O, to the K2O and to the H2O being (8-20) to 1 to (0.5-3) to (0.5-3) to (300-800) to obtain initial aluminosilicate sol, then adding artificial synthesis structure induction species of which the mass percentage is about 1-20%, performing low-temperature ageing, performing high-temperature crystallization, performing solid-liquid separation, and performing drying so as to obtain high-crystallinity HEU type zeolite. According to the preparation method disclosed by the invention, the crystallization period can be greatly shortened and can be shortened to 12h, and besides, the synthesized HEU type zeolite can be guaranteed to have small and uniform grain size (1-3[mu]m); and after ion exchange modification, different ion exchange modified adsorbents can be obtained, and the selective adsorption capacity of the adsorbents to N2 in N2 / CH4 mixed gas is obviously improved and can be improved by 2-15 times.

The invention relates to a crystallization process, and more particularly relates to a crystallization process in a production process of crystalline fructose. The crystallization process comprises primary crystallization of a horizontal crystallizer and deep crystallization of a vertical crystallizer. The crystallization process has the beneficial effects that the small horizontal crystallizer is additionally provided for primarily crystallizing syrup without needing higher dry concentration, the crystallization yield is increased through controlling pH, degree of supersaturation and seed crystal proportion and adopting a mode of combining primary crystallization and deep crystallization, and is capable of reaching about 53 percent; the dry concentration is reduced, thus the consumption of steam during evaporation and condensation is reduced, the material dry concentration is reduced to ensure that the rotation of a rotation stirring system of each crystallizer is more easily carried out, the mechanical resistance is reduced, the application performance of equipment is improved; the dry concentration is reduced, thus the primary temperature of crystallization is lowered, the temperature reduction enables the crystallization period to be shortened so that the crystallization efficiency is increased, the equipment utilization rate is increased, the ice water consumption is reduced, and the energy resource is saved.