14 results about "Short path distillation" patented technology

This invention discloses a method for preparing high-purity Si-75, comprising: S1, adding sodium sulfide, sulfur, and deionized water in a molar ratio of 1:(1.0~1.1):(5~8) to a reaction vessel, adding a buffer, and reacting at 80~90℃ for 1~2h; S2, adding a phase transfer catalyst and a hydrolysis inhibitor to the system, adding γ-chloropropyltriethoxysilane dropwise, and reacting at 85~95℃ for 3~5h, allowing the mixture to stand and separate into layers after the reaction, to obtain an organic phase; S3, subjecting the organic phase to short-path distillation and then filtering to obtain high-purity Si-75. Compared with existing technologies, this invention uses a phosphorus-free buffer system, which simplifies waste treatment. It uses water as the reaction medium and does not use large amounts of organic solvents, making it suitable for continuous industrial production. By adding hydrolysis inhibitors, hydrolysis can be effectively prevented during the reaction, increasing safety. The short-path distillation method provides high purification efficiency and can quickly remove impurities. The product has a disulfide content of ≥98.5% and a color of 0 (Gardner color number), which is of great significance to the light-colored rubber industry.

The utility model discloses short-path distillation equipment for producing unsaturated mono-and diglycerol fatty acid esters, which comprises an evaporator, a wiped film component, a condenser component and a nitrogen nozzle, a jacket type temperature control layer is arranged on the outer wall of the evaporator, and a temperature control medium is introduced into the jacket type temperature control layer; the film scraping assembly is vertically arranged in the evaporator and comprises a rotatable center shaft and a plurality of sets of inclined scraping plates arranged in the axial direction of the center shaft, and the scraping plates are attached to the inner wall face of the evaporator. The condenser assembly is connected to the top of the evaporator and comprises a conical condensation cover, a corrugated plate structure is arranged on the surface of the conical condensation cover to increase the heat exchange area, and cooling pipelines are evenly distributed in the conical condensation cover; the nitrogen nozzle is arranged above the condenser assembly, and when the nitrogen nozzle sprays towards the surface of the condensation cover, a protective air curtain distributed along the condensation surface is formed, so that steam oxidation is prevented. The technical scheme of the utility model aims to improve the recovery efficiency and purity of products.

This invention provides a short-path distillation apparatus comprising a distillation tank, a distillation tube, a cooling tube, and a separating component. The distillation tank has a heating zone; the distillation tube is located within the heating zone and is connected to the inlet, a first outlet, and a second outlet; at least a portion of the cooling tube is located inside the distillation tube and is coaxially arranged with it; the cooling tube is used to condense the gas corresponding to the liquid material vaporized by the heating medium in the heated zone of the distillation tube, obtaining condensed liquid; the separating component is located inside the distillation tank and below the distillation tube, and is used to guide the liquid material vaporized by the heating medium in the unheated zone of the distillation tube to the first outlet and to guide the condensed liquid to the second outlet. This invention can separate light and heavy components in liquid materials and is also suitable for large-scale distillation.

Various aspects of this disclosure relate to methods to lower the activation energy of the cannabinoid decarboxylation reaction by performing the decarboxylation reaction in the gas phase. In some specific embodiments, the method relates to the decarboxylation of a cannabinoid performed in a short-path distillation apparatus or a thin-film distillation apparatus.

The present invention relates to a continuous manufacturing method for obtaining high-purity alkylphenol novolac resins with high yield and without loss by using a Short Path Distillator (SPD), which is an advanced thin-film distiller with a built-in condenser, to feed general-purpose alkylphenol novolac resins as a feed liquid (raw material), thereby obtaining unreacted phenol monomers including alkylphenol monomers that are raw materials for these resins as distillation components, and simultaneously removing these phenol monomers as residual components to 0.1 weight% or less. The invention also relates to a composition containing the same. To this end, the present invention specifies in detail the form and structure of an advanced type of SPD facility, and in addition to general matters, specifies the form of the internal condenser, the form and material of the internal rotating body, and the input and output facilities for continuous production. In addition, SPD process conditions such as evaporator temperature, condenser temperature, vacuum level, feed rate, and internal rotor rotation speed were presented to maximize the yield and purity of high-purity alkylphenol novolak resin while avoiding thermal deformation and minimizing commercial losses due to excess conditions, and the characteristics of the high-purity alkylphenol novolak obtained through this were specified. In addition, the obtained high-purity alkylphenol novolak resin was applied to rubber and tire compositions and copper clad laminate compositions to demonstrate the improved properties of these compositions.

This utility model relates to a discharge structure for a short-path distiller. It solves the technical problems of existing traditional short-path distillers where the limited inclination of the high-boiling-point outlet fails to meet the discharge requirements of high-boiling-point materials. The structure includes a distiller shell with a feed inlet at the top, an internal condenser and a scraper assembly, a heating assembly on the outer periphery of the distiller shell, a condenser tube box on the inner side of the distiller shell, and a conical discharge cylinder at the lower end of the distiller shell. A high-boiling-point region is formed between the outer periphery of the condenser tube box and the interior of the conical discharge cylinder. A high-boiling-point outlet is located at the bottom of the conical discharge cylinder, and a low-boiling-point region is formed at the internal condenser. The low-boiling-point region is connected to the low-boiling-point outlet via a low-boiling-point guide pipe. The advantages are: the conical discharge cylinder design guides high-boiling-point materials to slide rapidly down the guide cone surface, reducing dead zones, and gravity-assisted discharge prevents high-boiling-point material from accumulating.

The present application relates to polyester recycling, and provides a method for improving the yield and purity of regenerated BHET. After glycolysis of waste polyester in the presence of a metal catalyst, most of the free glycol is removed by evaporation under reduced pressure. A chelating agent composed of a polycarboxylic acid chelating agent and an organic phosphonic acid compound is added to the glycolysis solution, and a fixed bed circulation contact of a solid-supported chelating agent with polycarboxylic acid groups supported on a porous carrier is used to remove metal ions. Subsequently, the glycol is further removed by thin film evaporation to obtain a BHET-rich glycolysis solution. Finally, the distillate is collected in a short path distiller according to the set switching conditions of BHET content and acid value to obtain a high-purity BHET product. This method can inhibit re-polymerization and thermal degradation, reduce metal residues and oligomer content, and improve the yield and purity of BHET.

The utility model discloses a multifunctional short-range distillation sleeve internal part, and belongs to the technical field of short-range distillation sleeves. The condenser further comprises a clamping part and an angle adjusting part, the condenser pipe is clamped in the clamping part, and the clamping part is arranged at the adjusting end of the angle adjusting part; the angle adjusting part comprises a disc, a linkage rod rotationally connected to the circle center of the disc and a pointing tip fixed to one end of the linkage rod, an angle dial gauge is arranged on the outer wall of the disc, and the tip end of the pointing tip points to the angle dial gauge of the disc; the clamping part comprises an annular frame and a clamping plate arranged at one end of the annular frame, the condenser pipe is clamped between the clamping plate and the annular frame, and the annular frame is fixed to the end, away from the pointing pointed end, of the linkage rod. And the operation is more convenient and quicker.

The invention relates to polyester recovery, and provides a method for improving the yield and purity of regenerated BHET. The method comprises the following steps: carrying out ethylene glycol alcoholysis on waste polyester in the presence of a metal catalyst, and carrying out reduced pressure evaporation to remove most free ethylene glycol; adding a chelating agent consisting of a polycarboxylic acid chelating agent and an organic phosphonic acid compound into the alcoholysis solution, and performing fixed bed cyclic contact with an immobilized chelating agent immobilized on a porous carrier by matching with polycarboxylic acid groups to remove metal ions; ethylene glycol is further removed through film evaporation, BHET-enriched alcoholysis liquid is obtained, switching conditions are set in a short-path distiller according to the BHET content and the acid value, fractions are collected, and a high-purity BHET product is obtained. According to the method, repolymerization and thermal degradation can be inhibited, the content of metal residues and oligomers is reduced, and the yield and purity of BHET are improved.

This invention belongs to the field of polymer material additive synthesis technology, specifically relating to a method for preparing a mixed environmentally friendly plasticizer base material rich in asymmetric esters, as well as the base material and the mixed environmentally friendly plasticizer. The method includes the following steps: (1) Preparation of esterification reactants: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is mixed with benzoic acid, and an azeotropic dehydrating agent is added; (2) Addition of a composite reaction inhibition system: A composite Lewis acid catalyst and a binary composite antioxidant are added to the system; (3) Stepwise esterification and liquid-based gas stripping to remove water: An azeotropic dehydration reaction with stepwise temperature increase is carried out under a protective atmosphere; (4) Separation and purification: The crude reaction liquid obtained in step (3) is washed, and after removing light components, it is sent to a scraped film molecular evaporator for short-path distillation. The distillate on the condensation surface is collected to obtain the environmentally friendly plasticizer base material. This invention aims to improve the yield of asymmetric esters by combining the optimization of catalysts with the enhancement of hydrodynamic mass transfer.

The invention provides a method for removing volatile matters in caprolactone polyol. The method comprises the following steps: introducing a caprolactone polyol raw material into short-path distillation equipment for short-path distillation, regulating the main evaporation temperature to 230-260 DEG C and the vacuum degree to 0.01-0.50 mbar, controlling the inner cooling temperature to 30-40 DEG C and the feeding temperature to 100-130 DEG C, and regulating the condensation refrigeration temperature of a first-stage cold trap and a degassing section to-25--15 DEG C; finally, a heavy-phase product treated by the short-path distillation equipment is collected, the acid value of the heavy-phase product is smaller than or equal to 0.10 mgKOH / g, the chromaticity is smaller than or equal to 20 Hazen, and the dispersion coefficient PDI is smaller than or equal to 1.22. Through a short-path distillation technology and under the synergistic effect of a specific main evaporation temperature, an ultrahigh vacuum environment and a feeding amount, the low-temperature limitation of traditional reduced pressure distillation is broken through, volatile matters are efficiently removed, hydroxyl oxidation and molecular cross-linking side reactions are effectively inhibited, and meanwhile, the acid value, the chroma and the PDI value in caprolactone polyol are reduced.

This invention discloses a soybean phospholipid oil powder production device based on microcapsule technology, belonging to the field of powdered phospholipid production technology. It includes a tank body and a conical tank. The tank body houses a hydration and degumming section, an acid-base neutralization section, a centrifugation section, a falling film evaporation section, and a short-path distillation section. The hydration and degumming section and the acid-base neutralization section are located within the conical tank. A condensate recovery cylinder is installed at the bottom of the conical tank, and a solenoid valve and a water supply pipe are installed at the bottom of the condensate recovery cylinder to discharge condensate. A wastewater discharge pipe is installed on the centrifugation section. This invention utilizes the hot steam generated by the falling film evaporation section to heat the mixed solution reacting in the hydration and degumming section and the acid-base neutralization section, thereby improving the efficiency of the hydration and degumming reaction, the acid-base neutralization reaction, and the centrifugal separation while reducing energy and resource consumption. Furthermore, the use of condensate to clean the centrifuge improves the continuous operation capability of the equipment.

The present application relates to a kind of waste lubricating oil regeneration base oil refining process, comprising the following steps: step S1: remove solid waste: remove solid waste in waste lubricating oil by centrifugal sedimentation;Step S2: flocculation treatment: the waste lubricating oil obtained in step S1 and gel state polydimethyl diallyl ammonium chloride (PDMDAAC) powder are mixed according to the proportion of 1:10-15 by mass ratio, fully stirred evenly, make gel state PDMDAAC powder and waste lubricating oil fully contact reaction, after reaction, filter, sedimentation separation waste lubricating oil and impurity-containing gel state PDMDAAC powder, obtain waste lubricating oil;Step S3: thin film evaporation: the obtained waste lubricating oil is preheated to 130 DEG C, and sent into thin film evaporator and carries out distillation;Step S4: short path distillation;Step S5: blending and refining, and the regenerated base oil is obtained.The present application has the advantages of simple process, convenient operation, and is suitable for industrial production.The present application realizes the stable synthesis of PDMDAAC colloid by accurately controlling reaction conditions, and improves the purity and performance of product.

The invention relates to a high-temperature synthesis process of a high-yellowing-resistance antioxidant 168, which belongs to the technical field of high polymer material assistants, and comprises the following steps: by taking trialkyl phosphite and 2, 4-di-tert-butylphenol as raw materials, carrying out transesterification under the protection of inert gas and under high-temperature and high-vacuum conditions, and carrying out post-treatment of a film evaporator or a short-path distiller to deeply remove free phenol, thereby obtaining the high-yellowing-resistance antioxidant 168. The antioxidant 168 product is obtained through recrystallization and drying, the content of free 2, 4-di-tert-butylphenol in the product is smaller than or equal to 30 ppm, the yellowing defect caused by antioxidant residues, especially free phenol residues, of high-end products is fundamentally overcome, and the effect is remarkable.