7 results about "Diisopropyl ether" patented technology

The invention relates to a method for synthesizing polymeric dyes by polymerizing polymerizable monomers bearing polymerizable functional groups (e.g., acrylates, methacrylates, acrylamides or methacrylamides) and chromophore functional groups, in which the polymerization is carried out in a solvent selected from a mixture of methyl ethyl ketone and ethanol or acetonitrile, and the purification of the resulting polymeric dye is carried out with a solvent selected from the group consisting of diisopropyl ether, methyl tert-butyl ether, dimethyl carbonate, ethyl acetate and water. The invention also relates to the resulting polymeric dyes and to ink compositions comprising same. In particular, the following polymeric dyes are disclosed:.

This application discloses a method for preparing diisopropyl ether from propylene hydration. A raw material containing propylene and water is contacted with a catalyst and reacted to obtain a product containing diisopropyl ether. The catalyst consists of a support and an active component supported on the surface of the support; the support is an Hβ molecular sieve; the active component is selected from at least one of CuO, Fe2O3, and CoO. The reaction is fast, with high yield, and can be applied to large-scale production. The catalyst preparation method is stable, controllable, and reproducible.

The purpose of the present invention is to provide a means for obtaining SMTP from a fermentation product including SMTP via a method that can easily be scaled up; to provide an SMTP crystallization method; or to provide a means for obtaining SMTP via a method including SMTP crystallization. The present invention provides an SMTP production method including: a step I for putting a Stachybotrys microspora fermentation product in contact with an aqueous solvent having a pH of 9 or greater and obtaining an extract liquid including SMTP; a step II for supplying the extract liquid obtained in step I for purification and obtaining a purified product; and a step III for crystallizing the SMTP included in the purified product obtained in step II in a crystallization solvent including one or more selected from the group consisting of ethyl acetate, butyl acetate, acetone, 2-butanone, diisopropyl ether, diethyl ether, methyl-tert-butyl ether, and acetonitrile. Alternatively, provided is an SMTP production method including a step for crystallizing SMTP having a purity of 70% or greater in a solvent including one or more selected from the group consisting of ethyl acetate, butyl acetate, acetone, 2-butanone, diisopropyl ether, diethyl ether, methyl-tert-butyl ether, and acetonitrile. Alternatively, provided is an SMTP production method including putting a Stachybotrys microspora fermentation product in contact with an aqueous solvent having a pH of 9 or greater and obtaining an extract liquid including SMTP.

The utility model provides a phenol tower distributor for a phenol ammonia recovery system, which comprises a phenol tower and an MIBK feed distributor, the phenol tower comprises a bottom fixed part, a barrel and a top elliptical head part, a support convenient for supporting and fixing the MIBK feed distributor is arranged in the barrel, the MIBK feed distributor comprises an MIBK main tank, a first branch tank, a second branch tank and a third branch tank, and the first branch tank, the second branch tank and the third branch tank are communicated with each other. The phenol tower distributor rectification method is mature in technology and simple to operate, the purity of the regenerated extractant is high, and the influence on the extraction effect is small when the extractant is recycled; the alkali washing back extraction method has the characteristic of low energy consumption, but the impurity content of an extracting agent regenerated by the back extraction method is higher, and the recovered crude phenol exists in the form of a sodium phenolate solution. And compared with MIBK, the diisopropyl ether has the advantage that the distribution coefficient of the diisopropyl ether to polyphenol is low.

The invention relates to a method for separating diisopropyl ether, isopropanol and water by a mixed extractant extractive distillation process combined with a pre-concentration function, by utilizing the characteristic that the relative volatility of azeotropic composition of a diisopropyl ether-isopropanol-water mixture is changed towards the direction of easier separation along with the addition of a mixed extraction agent, a pre-concentration tower (PDC), a rectifying tower (EDC1), a rectifying tower (EDC2) and a solvent recovery tower (SRC) are operated, efficient separation of a ternary mixture is realized, the purity of separated diisopropyl ether is greater than 99.90% (mass fraction), and the purity of the separated diisopropyl ether is greater than 99.90% (mass fraction). The purity of isopropanol is greater than 99.90% (mass fraction), the purity of water is greater than 99.90% (mass fraction), and the purity of the mixed extractant recovered from the bottom of the rectifying tower SRC is greater than 99.90% (mass fraction). The method solves the problems that the diisopropyl ether-isopropanol-water mixture with high water content is high in consumption, difficult to separate and the like when being subjected to common rectification, is flexible to operate, economical and environment-friendly, and can realize effective separation of the ternary azeotropic mixture through four towers.

To provide a method for preparing solid crystalline form I of tert-butyl (S)-2-((2S,3R)-1-amino-3-hydroxy-1-oxobutan-2-yl)-1-oxo-2,5-diazaspiro[3.4]octane-5-carboxylate.SOLUTION: Provided is a method comprising the steps of: dissolving tert-butyl (S)-2-((2S,3R)-1-amino-3-hydroxy-1-oxobutan-2-yl)-1-oxo-2,5-diazaspiro[3.4]octane-5-carboxylate in ethyl acetate; heating the solution; cooling the solution; and adding diisopropyl ether to the solution.SELECTED DRAWING: Figure 8

The present invention relates to a method for preparing a glucagon-like peptide by precipitating the peptide or precursor peptide by mixing with an anti-solvent comprising diisopropyl ether and acetonitrile. Furthermore, the present invention relates to a peptide conjugated to a solid phase and a pharmaceutical composition comprising liraglutide obtainable according to the method of the present invention.