36results about How to "Purification process reduction" patented technology

The present invention discloses an apparatus and a method for continuously separating and purifying durene. The apparatus comprises: a vertical tower body and a horizontal tower body, wherein rotation scrapers are respectively arranged inside the vertical tower body and the horizontal tower body, the outer side of the vertical tower body is provided with a constant temperature material inlet, the vertical tower body is sequentially provided with a residue liquid recovery section and a crystal purification section from top to bottom, the horizontal tower body comprises a crystal collection section and a melting crystal reflux section, the melting crystal reflux section comprise a constant temperature melting crystal collection tank, a reflux pump and a heater, and the melting crystal reflux section is connected with the crystal purification section through a reflux port. The method comprises that: a durene raw material continuously enters the apparatus, and is sequentially subjected to countercurrent washing, re-crystallization and purification separation to obtain the pure durene. With the apparatus and the method, continuous material feeding, continuous high purity durene crystal extraction and continuous residue liquid recovery can be achieved.

The invention discloses a preparation method of tamsulosin hydrochloride with high optical purity, and belongs to a medicine technology and a chemical field. A recrystallization method is adopted, crude products of (R)-5-(2-(2-(2-ethoxyphenoxy) ethyl amino) propyl)-2-methoxyl phenyl sulfonamide hydrochloride are refined, so that pure products of the (R)-5-(2-(2-(2-ethoxyphenoxy) ethyl amino) propyl)-2-methoxyl group sulfonamide hydrochloride of which the e.e. value is larger than 99.8% is obtained; a crystallizing solvent adopted by the recrystallization method is a mixed solvent consisting of an organic solvent and water, the organic solvent is selected from one of methanol, ethyl alcohol, acetone, acetonitrile and isopropyl alcohol, and the recrystallization temperature is under 15 DEG C. The preparation method disclosed by the invention is simple to operate, short in period, low in cost and good in repeatability, and can solve the inevitable problem of rework for treatment in the industrial production.

The present invention discloses the preparation process of heat labile enterotoxin of E. coli, and the preparation process has intracellular expression or secretory expression of LT or LTB in yeast cell. Exogenously expressing LT and its mutant or subunit in eukaryotic yeast cell has greatly raised expression level. The present invention constitutes multicopy LT or LTB subunit expression kit, has increased gene dosage of LT or LTB in yeast, LT or LTB gene recombination following alcohol dehydrogenase promoter as the powerful promoter of Pichia yeast expression vector, methanol induced high expression of exogenous protein in yeast cell and thus raised expression level of LT and its mutant or LTB in yeast cell, simple post purification and safe clinical application. The present invention has low production cost and high target protein yield, and is significant in the scale production and clinical application of mucous membrane adjuvant.

The invention relates to a multifunctional composite gas purification film material, which comprises a film layer and a substrate, wherein the film layer is a polytetrafluoroethylene biaxial stretch film; the substrate is formed by mixing carrier fiber and low-temperature denitration catalysis fibers; the carrier fiber accounts for 40 to 70 weight percent and is a mixed material of organic fiber and inorganic fiber; the inorganic fiber accounts for 10 to 30 weight percent; the low-temperature denitration catalysis fiber has a bead particle structure; the bead particle diameter is 0.1 to 3 mum;the catalysis active ingredients comprises 20 to 50 weight percent of TiO2, 5 to 15 weight percent of Mn, 3 to 10 weight percent of Cr, 10 to 20 weight percent of V, 1 to 10 weight percent of Sn, 0.5to 2 weight percent of Ce and 0.5 to 2 weight percent of Cu. The dust removal and the denitration are performed at 120 to 160 DEG C; the dust removal and the denitration are coupled; the tail gas purification process is shortened; the dimension of the tail gas purification equipment is reduced; the heat recovery and utilization efficiency in the tail gas is improved.

The invention discloses a method and device for removing metal impurities in polycrystalline silicon by electron beam overheat smelting, and belongs to the field of metallurgy. The device comprises a water-cooled copper smelting crucible, wherein an inclined sidewall design is adopted for the water-cooled copper smelting crucible; the inner sidewall of the water-cooled copper smelting crucible forms an included angle of 105 to 120 degrees with the bottom of the water-cooled copper smelting crucible; a graphite bushing is arranged in the water-cooled copper smelting crucible; the outer surface of the graphite bushing is attached to the inner surface of the water-cooled copper smelting crucible to form a close fit design; the bottom of the graphite bushing and the bottom of the water-cooled copper smelting crucible are horizontal, the inner surface sidewall of the graphite bushing forms an included angle of 95 to 100 degrees with the bottom of the graphite bushing. According to the device, the metal impurities are removed by overheat smelting, so that the number of times of subsequent directional solidification and ingot casting can be reduced, a purification process can be eliminated, and the production cost can be reduced; by electron beam overheat smelting for polycrystalline silicon purification, post directional solidification can be reduced by one time or more, and the metal impurities in the polycrystalline silicon can be reduced by 30 percent or more.

The invention discloses a method for expressing human interleukin 7 in eucaryotic host. When the eucaryotic host is pichia X-33, the method comprises the following steps of: (1) cloning an IL-7 gene of human; (2) building an eucaryotic expression vector; (3) transforming recombinant vector to the eucaryotic yeast host; and (4) expressing a rIL-7 protein in the yeast host. A prior method for expressing IL-7 by using prokaryotic host escherichia coli is changed, and a method for expressing IL-7 through eucaryotic host pichia is searched out, thereby ensuring an IL-7 biologic activity and obtaining a large amount of stable protein.

The invention provides a method for preparing liquefied natural gas (LNG) through sulphur-tolerant methanation of coke-oven gas. The method is characterized by subjecting the coke-oven gas to direct three-stage methanation reactions on a supported molybdenum-based sulphur-tolerant methanation catalyst after removing the impurities such as oil, naphthalene, benzene and the like from the coke-oven gas, then removing the impurities such as sulphur, CO2, C2-4 hydrocarbons and the like once through rectisol, and finally separating N2, H2 and the like through one-time subzero liquefaction, thus obtaining the LNG with methane content higher than 97%. The method has the advantages of simple process flow, small equipment investment, low comprehensive energy consumption and excellent natural gas products.

The invention provides a method for separating and purifying red kidney bean vegetable hemagglutinin and thyroglobulin. The method mixes crude extract of red kidney bean vegetable hemagglutinin in redkidney bean with crude extract of thyroglobulin; the mixture is then extracted by coprecipitation method, purified and separated to respectively obtain hemagglutinin monomer and thyroglobulin. The method directly extracts vegetable agglutinin from red kidney bean and is applicable to obtaining of vegetable hemagglutinin without extraction of vegetable hemagglutinin after extracting of vegetable agglutinin, thereby simplifying purification process. Material used in the method is low in cost and wide in sources, and the raw materials are easy to obtain. The method has low production cost, simple operation and high yield which are applicable to industrial mass production. The vegetable hemagglutinin extracted by the method has not only high activity and high yield, but also low cost and short cycle. The method obtains hemagglutinin monomer together with thyroglobulin that the method has high product economic value, excellent generalizability, and relatively high economical and utility value.

The invention discloses an apparatus and a method for continuously separating o-isopropylphenol and p-isopropylphenol. The apparatus comprises: a tower 1 and a tower 2, wherein the tower 1 and the tower 2 are connected in series, rotation scrapers are respectively arranged on tower body axis centers inside the tower 1 and the tower 2, the lower portion inside the tower 1 is provided with a grid, the outer sides of the tower 1 and the tower 2 are provided with constant temperature material inlets, a liquid purification section, a crystal purification section, a melting purification section and a crystal deposition section are sequentially arranged inside the tower 1 from top to bottom, a residue liquid recovery section, a crystal re-purification section and a crystal re-deposition section are sequentially arranged inside the tower 2 from top to bottom, and an outlet on the bottom of the tower 1 is connected with the constant temperature material inlet on the middle part of the tower 2. The method comprises that: a material requiring separation is subjected to continuous re-crystallization in the tower 1 and the tower 2 to separate o-isopropylphenol and p-isopropylphenol. With the apparatus and the method, continuous material feeding and material discharging can be achieved, and high purity o-isopropylphenol and p-isopropylphenol products can be produced.

The invention discloses a method for preparing high-purity wolfbane B, which comprises the following steps: pulverizing Euphorbia chamaejasma, extracting with ethanol reflux, filtering the extract to obtain a filtrate; concentrating the filtrate, recovering ethanol to obtain a thick paste; Add 5 to 10 times the amount of silica gel to the thick paste, mix well, dry, perform column chromatography with silica gel as the carrier, elute with the eluent and collect the eluent; concentrate the eluent, recover the solvent, and obtain Coarse crystals of chamaejamabolin; dissolve the crude crystals with ethanol, add silica gel to mix, dry, and perform silica gel column chromatography for 2 to 3 times to obtain pure chamaejamacin. The extraction and purification cost of the method of the invention can be reduced by about 20%, and at the same time, the energy consumption can be greatly reduced, and the extraction efficiency of chamaejasme B can be increased to more than 30%. The prepared chamaejamasin B has a purity of more than 99%, and is especially suitable as a standard substance for content determination of chamaemachamata medicinal material and related preparation Jiejieling tablets.

The method for yeast cell to express human interleukin 10 (hIL-10) has the technological scheme including artificially synthesizing all-gene sequence of hIL-10 including signal-carrying hIL-10 sequence, named shIL-10, and no-signal hIL-10 sequence, named nshIL-10; adding to the ends with EcorR I enzyme incising sequence and Not I enzyme incising sequence or with EcorR I enzyme incising sequences; double incising with EcorR I and Not I the integral expression vector pPIC3.5K and Ppic9K of destination gene shIL-10, nshIL-10 and Pichia yeast; constituting recombinant plasmid pPIC3.5K / shIL-10 and Ppic9K / nshIL-10; converting Pichia yeast cell via electrical perforation and plasmodic granule process; integrating recombinant plasmid and destination gene to yeast chromosome; and applying methanol to induce Pichia yeast for intracellular soluble expression and extracellular secretion type expression. The present invention is superior to expression in colibacillus.

The invention discloses an infrared degradation method for ocean sulphated polysaccharide. The method comprises the following steps that ocean sulphated polysaccharide dry powder is laid on a clean stainless steel tray, the thickness ranges from 0.1 cm to 0.2 cm, the ocean sulphated polysaccharide dry powder is placed in a drying box containing a 2,200w infrared lamp to be heated for 2 h to 16 h, the height of the infrared lamp away from the ocean sulphated polysaccharide powder ranges from 10 cm to 30 cm, and low-molecular weight ocean sulphated polysaccharide dry powder is obtained. The infrared degradation method has the advantages that no chemical or biological reagent is introduced, the method is environmentally friendly, and subsequent purifying processes are reduced; the ocean sulphated polysaccharide is degraded in the state of dry powder, limit of polysaccharide solubleness is avoided, production efficiency is high, and dissolving, drying and other unit operation are reduced; operation is easy and convenient, equipment is simple, and the production cost is low; good biological activity is achieved, low-molecular weight fucoidan obtained after infrared degradation is carried out for 16 h shows good bacteriostatic activity, and the bacteriostasis rate of the low-molecular weight fucoidan with the concentration of 1.0 wt% on escherichia coli reaches 100%.