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1608 results about "Sulfone" patented technology

A sulfone is a chemical compound containing a sulfonyl functional group attached to two carbon atoms. The central hexavalent sulfur atom is double-bonded to each of two oxygen atoms and has a single bond to each of two carbon atoms, usually in two separate hydrocarbon substituents.

Mixed ionic liquid solution special for absorbing SO2 gas and preparation method thereof

The invention relates to mixed ionic liquid formula solution, which consists of an ionic liquid A, an ionic liquid B and a mixed solvent C, wherein the positive ion of the ionic liquid A is the N,N-dialkyl imidazole positive ion or the N,N,N,N-tetra alkyl quaternary amine positive ion, while the negative ion thereof is the monobasic carboxylic negative ion; the positive ion of the ionic liquid B is the protonated alkylamine positive ion, while the negative ion thereof is the monobasic or binary or ternary carboxylic negative ion; and the mixed solvent C is aqueous solution of water, polyethylene glycol, polyglycol ether, propylene carbonate or tetramethylene sulfone. The mixed ionic liquid formula solution of the invention is strong base-weak acid and weak base-weak acid mixed salt solution, has wide pH buffering capacity, and can greenly efficiently absorb the SO2 gas in a reversible cycle mode. The mixed ionic liquid formula solution of the invention is adopted as a SO2 absorbent so that the requirement for the equipment required by SO2 absorption is simple, the operation condition of absorbing and desorbing SO2 is mild, the desulfurization efficiency is high, and the problems of waste solution and wastewater discharge and the like do not exist. The invention also discloses a preparation method for the mixed ionic liquid formula solution.

Synthetic process for efficiently and continuously producing 4,4-dichlorodiphenyl sulfone

The invention discloses a synthetic process for efficiently and continuously producing 4,4-dichlorodiphenyl sulfone, which comprises the following steps: carrying out Friedel-Crafts acylation on thionyl chloride and excessive chlorobenzene under the action of a lewis acid catalyst, carrying out pyrohydrolysis and adding chlorobenzene to carry out layering after the reaction is finished, adding anoxidizing agent into a sulfoxide organic layer to carry out oxidization, adding activated carbon to carry out decoloration and filtering; cooling filtrate and carrying out rejection filtration to obtain 4,4-dichlorodiphenyl sulfone. The synthetic process has the advantage that chlorobenzene not only is a raw material, but also is a reaction solvent, so that cross use of various solvents is avoided. Particularly, use of a great amount of acetic acid used as an oxidation reaction solvent is avoided, and corrosion to equipment and environmental pollution are avoided. In the integral process flow,separation and extraction of an intermediate 4,4-dichlorodiphenyl sulfoxide are avoided, so that production time of the product is greatly shortened, and production cost is saved. By using hydrogen peroxide, acetic acid and concentrated sulfuric acid as mixed oxidizing agents, oxidization capacity of hydrogen peroxide is greatly improved, yield and purity of the product are greatly improved, yield of the product reaches 90% or more, and purity of the product is greater than 99.8%.

Preparation method of high-purity mannan oligosaccharide

The invention discloses a preparation method of high-purity mannan oligosaccharide. The preparation method comprises the steps of 1, producing a mannan oligosaccharide mixture through enzymolysis conversion; 2, carrying out centrifugal separation: separating enzymatic hydrolysate through a centrifugal machine; 3, carrying out ceramic membrane filtration: filtering centrifugate through a ceramic membrane group as precision separation to remove protein, starch and polysaccharide substances; 4, carrying out ion exchange refining: desalting, decoloring and deodorizing filtrate through a mannan oligosaccharide ceramic membrane; 5, carrying out 2000 molecular weight ultrafiltration: ultrafiltering ion exchange refining liquid through a polyether sulfone-polyamide composite membrane with interception as Dalton to obtain a polymerization degree; 6, carrying out nanofiltration: filtering sugar liquid through a ceramic membrane, ion exchange refining and an ultrafiltration membrane; and 7, carrying out spray drying: preheating a nano-filtered concentrated solution, and drying in a spray drying tower. The dried product contains more than 95% of mannan oligosaccharide, and has an obvious function of multiplying bifidobacterium; meanwhile, the product, as a most promising substitute, can reduce harmful bacteria.

Method for preparing asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers

The invention discloses a method for preparing an asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers. A blending nanofiltration membrane with an asymmetric structure is prepared in one step by the nanofiltration membrane through a phase transformation method. The method comprises the following steps of: preparing casting membrane liquid, namely mixing the polyether sulfone, the sulfonated polysulfone high polymers, an additive and a solvent to prepare the casting membrane liquid; and forming a membrane by the phase transformation method, wherein the membrane comprises a flat membrane and a hollow fibrous membrane. The interception rate of the nanofiltration membrane to 0.5 to 1.5 g/L sodium chloride and 0.5 to 1.5 g/L sodium sulfate under the operating pressure of between 0.1 and 0.8 MPa is between 20 and 95 percent, the interception rate of the nanofiltration membrane to polyethylene glycol with the relative molecular mass of between 600 and 2,000 is between 40 and 99.9 percent, and the pure water flux of the membrane is between 10 and 250 L/(m2hbar). The asymmetric nanofiltration membrane of the invention has the advantages of high strength and toughness, high compactness resistance, chlorine resistance and high-temperature resistance, and can be applied to aspects of water treatment, wastewater treatment, material separation and the like.
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