35results about How to "Moderate boiling point" patented technology

The present inventions are (A) a solvent comprising at least one cycloalkyl alkyl ether (1) represented by the general formula: R1-O—R2 (wherein R1 is cyclopentyl or the like; and R2 is C1-10 alkyl or the like); (B) a method of preparations the ethers (1) characterized by reacting an alicyclic olefin with an alcohol in the presence of an acid ion-exchange resin having a water content of 5 wt % or less. The solvent is useful as cleaning solvent for electronic components, precision machinery components or the like, reaction solvent using various chemical reactions, extraction solvent for extracting objective organic substances, solvent or remover for electronic and electrical materials, and so on. The process enables industrially advantageous production of the objective cycloalkyl alkyl ethers (1).

The present invention relates to diol compound (II) or S-diol compound (II ') in C 4 -C 7 In the mixed solvent of ketone solvent and water, under alkaline condition, react cyclization with arylsulfonyl chloride or alkylsulfonyl chloride to obtain citalopram and S-citalopram. The solvent used in the invention has high solubility to reactants and products, thus reducing the amount of solvent used and improving production capacity, and at the same time, the post-treatment extraction effect is good and the operation is simple and convenient.

The invention relates to a kind of biomass raw material with starch as the main component and SO in an aprotic halogenated alkyl solvent 3 A new clean production process for synthesizing water-soluble starch sulfate with smooth reaction and high conversion rate. Utilizing the process can fully expand the use of starch-containing biomass raw materials, and the water solubility and binding performance of the product are significantly improved. The process is simple, the production process is clean and environmentally friendly, the conditions are mild, unreacted materials can be directly used or recycled, no toxic side ions and solvent residues, the product is light in color, safe and environmentally friendly, and can be used in a wide range of applications. It has huge industrial application prospects and significant The economic and ecological benefits meet the strategic requirements of vigorously developing natural renewable resources and sustainable development.

The invention discloses an extracting agent for purifying wet-process phosphoric acid and a method of extracting wet-process phosphoric acid by the extracting agent. The extracting agent comprises the following components in mass percent: 35%-95% of n-butyl alcohol, and 5%-65% of one of isooctyl alcohol, n-butyl ether, high-carbon ketone, aliphatic amine or quaternary ammonium salt. The method comprises the following steps of defluorinating and destaining crude wet-process phosphoric acid, and carrying out 6-10-level counter-current extraction according to a ratio of the extracting agent to crude phosphoric acid being (2-5) to 1, wherein sulfuric acid is added to a crude phosphoric acid inlet in the sixth or seventh level of counter-current extraction; and washing an extracting phase by using industrial phosphoric acid in which sodium carbonate is dissolved, re-extracting by using deionized water to obtain a re-extracting liquid, finally purifying the re-extracting liquid and performing concentration to obtain the industrial phosphoric acid. The extracting agent provided by the invention has the advantages that organic matters with close and moderate boiling points is subjected to binary compound, an extracting characteristic of a compound solvent is obvious, a property is stable, the extracting agent is easy to recycle and is reused for a long time, extraction is performed under room temperature and is energy-saving, crude phosphoric acid does not need to be purified in advance, the productive technology is simple, and the production cost is low.