1029results about How to "Low acid value" patented technology

The invention provides a method which uses palm oil to prepare biologic diesel oil and can lower the high acid value. The method uses solid super acids of SO>4<2- >/ZrO2, SO4< 2- >/TiO2, and SO4< 2- >/xZrO<2- yTiO2 as catalyst, and uses low-carbon alcohol as esterifying agent to pre-treat the high acid value palm oil, can effectively lower the acid value of the oil, and can ensure the acid vale of the obtained biologic diesel oil to easily meet the standard (less than 0.8mgKOH/g, ASTM). The catalyst used by the invention has high catalytic activity, and is reusable. The process flow is simple, the production cost is decreased, and the environmental pollution is reduced greatly.

The invention relates to a method for preparing polyol ester lubricating oil by using a composite solid acid catalyst. The method comprises the following steps of: adding a water carrying agent into polyol ester and monobasic fatty acid, performing esterification reaction under the action of the composite solid acid catalyst, and dehydrating and esterfying to obtain raw ester; performing filter pressing on the raw ester to separate the raw ester from the solid acid catalyst, wherein the catalyst can be recycled; and performing reduced pressure distillation on the raw ester to remove the residual fatty acid, and then deacidifying and decolorizing to refine with heating by using a refining adsorption bed layer respectively to obtain low-acid value polyol ester lubricating oil. The method has the advantages that the catalyst can be recycled, the esterification rate is high, an aftertreatment process is simple, and a product is low in acid value, high in purity, environment-friendly and suitable to be produced industrially. The reaction esterification rate can reach over 99 percent, and the acid value of the ester product obtained through refining can be controlled to be less than 0.01mg KOH/g. The product is excellent in visco-temperature performance, high in lubricity and thermal stability, strong in hydrolytic stability, low in volatility and excellent in electrical insulation property.

The invention provides a method for preparing acrylic aqueous dispersions with hydroxyl through two-step polymerization and the method comprises the synthesis of hydroxy acrylic resin, the removal ofsolvent, the neutralization and salt-formation and the deionized water dispersion, wherein the synthesis of hydroxy acrylic resin adopts two-step feeding synthesis method instead of one-step feeding method in prior art, the composition of the first added monomer mixture is different from that of the second added monomer mixture and preferentially, the weight percent of the second added hydrophilicmonomer is higher than that of the first added monomer when feeding tends to end up. The aqueous dispersions obtained by the technical solution of the invention reduces the dosage of monomer with hydroxyl so as to increase the water resistance of coating which is formed by combining aqueous dispersions and curing agent, reduce the grain size of dispersions, lower the viscosity and increase the stability obviously.

The invention discloses salt-spray-resistant and anti-aging water-based paint and a preparation method thereof. The salt-spray-resistant and anti-aging water-based paint is prepared from components in percentage by weight as follows: 40%-60% of a water-based epoxy ester emulsion, 8%-20% of an anti-rust pigment, 1%-5% of a coalescing agent, 4%-20% of filler, 0.5%-2% of a dispersant, 0.5%-2% of a defoaming agent, 0.3%-0.6% of an anti-settling agent, 0.1%-2% of an anti-rust agent, 0.5%-2% of a flash-rust inhibitor, 0.1%-2% of a wetting agent, 0.1%-0.5% of a mildew preventive, 0.1%-2% of a thickening agent, 0.1%-0.3% of a pH conditioning agent and 1%-20% of deionized water. The water-based paint can resist neutral salt spray for 550 H and resist QUV aging for 600 H, has the advantages of high water resistance, good storage stability, contamination resistance, fast drying, safety, environment-friendliness, simple preparation process and the like, is environment-friendly, accords with the environmental protection development trend and is suitable for industrial production.

The invention provides a preparation method of rice bran oil with the low acid value, which comprises the following steps: fresh-keeping the rice bran, extracting the rice bran oil, degumming, de-waxing, decolouring, deacidifying and deodorizing. The invention has the advantages of simple technology and low production cost; since the extracted crude rice bran oil is performed a fresh-keeping treatment, the acid value is relative low. The final finished product rice bran oil treated by the above steps is detected by a method prescribed by GB/T5530-2005, the acid value is between 1.0-3.0 (KOH) (mg/g).

The invention provides a method for deacidifying biodiesel, comprising the following steps of: mixing the biodiesel to be deacidified with a deacidification agent containing water-soluble alcohol, water-soluble amine and water, separating out an oil phase and an aqueous phase after layering, and refining the oil phase to obtain the biodiesel with a qualified acid value. The biodiesel to be deacidified can be a biodiesel intermediate with unseparated glycerol after the ester exchange between oil and alcohol, and can also be crude biodiesel which is removed with the glycerol or/and has a product acid value still out of limits after distillation for colloid removal. The method in the invention not only can be used for conveniently removing organic acid in the biodiesel and obviously reducing the acid value of the biodiesel, but also can be used for effectively reusing or recovering the organic acid and glycerol.

The invention discloses a process for lowering acid value of crude oil and distillate oil, which comprises proceeding esterification reaction by menthol with crude oil or naphthenic acid in distillate oil, producing naphthenic acid ester in fixed bed reactor equipped with catalyst, then recovering the non-reacted methanol through distillation. The catalyst comprises carrying agent, which includes aluminium oxide, silica gel, molecular sieve, diatomite and carclazyte, amounting to 20-98 wt% of the catalyst, and active component including Sn or Zn, amounting to 2-40 wt% of the catalyst.

The invention relates to a combined-cycle gas turbine lubricant combination which is suitable to be used in a large-scale gas steam combined-cycle gas turbine, and the composition and content of the combined-cycle gas turbine lubricant combination by weight percentage of antioxidant of 0.1 to 2 percent, anti-wear agent of 0.01 to 1 percent, no gray rust-proof agent of 0.01 to 1 percent, metal deactivating agent of 0.01 to 1 percent, anti-foam agent of 0.001 to 1 percent, the allowance is based oil, which is Class II or Class III paraffin-based oil, and the sulfur content is less than 0.03 percent, the lubricant combination of the invention has an extremely long induction period of oxidation and excellent performance of high temperature oxidation, excellent extreme pressure antifriction property and corrosion, good water separation, air separation and filterability, and can well meet the lubricating demand of large-scale combined cycle gas turbine.

The invention relates to an esterification deacidification process for high acid number rice bran oil, and the process can well solve the problem of a low refining rate. The esterification deacidification process for high acid number rice bran oil comprises grease pretreatment, namely two steps of degumming and decolorizing. A decolorized substance is obtained after the decolorizing, and then esterification deacidification is carried out. The concrete operating method comprises the following steps of: adding glycerin after the decolorized substance is stirred and heated at a vacuum degree of 0.09 MPa; adding a catalyst of zinc oxide or zinc to carry out a catalytic reaction to generate low acid number rice bran oil with an acid number of 5-7mgKOH/g. The zinc oxide or zinc which is taken as the catalyst of the esterification deacidification of the high acid number bran oil can effectively boost the esterification reaction and rapidly reduce the acid number; simultaneously the process overcomes the problems of the low refining rate lying in a traditional refining method and a great deal of sewage produced by a chemical alkali refining method; the zinc oxide or zinc has a low price, thereby reducing production cost; compared with other chemical esterification catalysts, the zinc oxide or zinc has a very low toxity, thereby being very suitable for the production of edible grease.

A nano-size (10-200 nm) incombustible polyether polyol polymer (MPP) is prepared through dispersing or locally grafting tripolycyanamine, cyanoguanidine and formaldehyde on high-activity polyether polyol at 40-160 deg.C for 5-16 hr. Said MPP has viscosity lower than 2300 MPa.s/25 deg.C and density of 1.120-1.126g/ml, and can be used along with high-activity polyether polyol and assistant to prepare high-resilience foam polyurethane plastics.

The invention discloses a method for extracting tea seed oil by using an enzymatic hydrolysis method, which comprises the following steps of: airing, unshelling, husking and pulverizing tea seeds; carrying out enzymolysis on the tea seeds in the material-liquid ratios of 1:3 to 1:5 at the extraction temperature of 40-60 DEG C for 1-5h with the enzyme quantity of 40-600U under the pH natural condition; centrifugally layering; adding an organic solvent into centrifugal liquid and extracting; and rotating and evaporating to obtain an oil sample. By adopting the scheme, the method has the advantages of low temperature for equipment operation, low energy consumption, high purity of extracted oil, low content of phospholipid, low acid value and low peroxide value, shallow color, low BOD (Biochemical Oxygen Demand) and COD (Chemical Oxygen Demand) values, easiness of treatment and less pollution, and the oil yield ratio is up to 23.1 percent.

The present invention relates to a fluorene-based resin polymer, and a photosensitive resin composition including the same, and the fluorene-based resin polymer according to the exemplary embodiment of the present invention has a high molecular weight, a low acid value, and excellent developing property, adhesive property and stability.

The present invention relates to a kind of water dispersible sulfonated polyester polyol and its preparation process. It is prepared through the ester exchange reaction between dimethyl isophthalate-5-sulfonate and diol to obtain sulfonated diol, and further esterifying dewatering reaction to obtain water dispersible sulfonated polyester polyol. Owing to the homogeneous block distribution of hydrophilic sulfonated groups in main polyester chain, the product has high dispersion in water, may find its wide application in water soluble environment protecting products and may be used directly in water soluble polyurethane paint, adhesive, etc.

The invention belongs to the technical field of biopharmacy and provides a method of extracting DHA and EPA in the type of triglyceride from deep-sea fish. The method includes steps of: preparing crude fish oil with enzymolysis technology, preparing free fatty acid, separating poly-unsaturated fatty acids containing the EPA and the DHA through a urea-embedding method, and preparing the fatty acid triglyceride of the DHA and the EPA. The method can effectively extract and enrich the DNA and the EPA from the deep-sea fish. The obtained crude fish oil is low in acidic value and is high in hydrolysis degree of esterified fatty acids. The finally products of the DHA and the EPA are in the type of triglyceride with the contents of the DHA and the EPA are in the type of triglyceride being high.

The invention discloses special lubricating oil for a fuel gas engine of a public transport automobile. The special lubricating oil is prepared from blended base oil, binary ethylene-propylene rubber, polymethacrylate, alkylphenol calcium sulfide, high-base-number calcium alkylbenzenesulfonate, polyisobutylene succinimide, boronated polyisobutylene succinimide, alkylated phenyl-alpha-naphthylamine, p,p'-dioctyl diphenylamine, a hindered phenol type antioxidant, dialkyl molybdenum dithiocarbamate, copper nanoparticle anti-wear additives, methyl silicone oil and thiadiazole polysulfide. According to the lubricating oil composition oil product, the sulfate ash content is lower than 0.5%, the content of phosphorus is lower than 0.03%, and the base number is 3-8mgKOH/g. According to the special lubricating oil for the fuel gas engine of the public transport automobile, aiming at the special requirements of the public transport automobile on engine oil, different additive varieties and charging sequences are adopted, so that physical and chemical indicators and use performance of the special lubricating oil are better than natural gas engine lubricating oil of the same grade, and the special lubricating oil has excellent cleaning and dispersion properties, lubricating property, abrasion resistance and oxidation resistance.

The invention relates to an odorless ultraviolet-curing wood lacquer and a preparation method thereof. The wood lacquer is prepared from the following components in percentage by weight: 45-65% of ultraviolet-curing resin, 10-25% of reactive monomer, 5.0-15% of talcum powder, 5.0-15% of transparent powder, 0.5-1.0% of gas-phase silicon dioxide, 1.0-5.0% of photoinitiator, 0.2-0.5% of defoaming agent, 0.2-1.0% of leveling agent and 0.2-1.2% of wetting agent. The odorless ultraviolet-curing wood lacquer does not have irritating odor before and after construction, does not contain benzene, and can be used immediately after construction; and meanwhile, the surface effect and fullness are not inferior to those of nitrocellulose dope, unsaturated paint or polyester paint.

The invention discloses a method of preparing m-phthalic acid diglycol ester-5-sulphonate by directly esterifying m-phthalic acid-5-sulphonate. The m-phthalic acid-5-sulphonate (SIPA) and glycol (EG) are used as raw material and are directly esterified to prepare the m-phthalic acid diglycol ester-5-sulphonate (SIPE); the esterification rate is more than 99 percent, the acid value is less than 1(mgKOH/g), and the content of diglycol (DEGA) is less than 2.0 percent. Therefore, the m-phthalic acid diglycol ester-5-sulphonate (SIPE) which is manufactured by adopting the method is almost esterified completely; the disadvantages of high equipment investment, high recovery cost of methanol, and going against environment protection are elminated when the m-phthalic acid diglycol ester-5-sulphonate (SIPE) is prepared by using dimethyl-m-phthalate-5-sulphonate (SIPM) through an interesterification method; the m-phthalic acid diglycol ester-5-sulphonate (SIPE) has the characteristics of low acid value, high purity, less byproducts, etc.; the m-phthalic acid diglycol ester-5-sulphonate (SIPE) is used as a dye modifier or a third monomer and is added in polyester, so that the mass-producing demand is achieved; the method is a preparation method with stable way and excellent quality.

The present invention is technological process of preparing biological diesel oil with vegetable oil niger, and features that vegetable oil niger is prepared into biological diesel oil through acidifying with 50 % concentration sulfuric acid solution to obtain acidified oil, adding methanol to react and separating out esterified resultant, adding 20 % concentration methanol solution to obtain crude methyl fatty ester product, molecular distilling the crude methyl fatty ester product to obtain light methyl fatty ester component as the biological diesel oil product with purity up to 95 %. The present invention adopts twice esterification to convert high acid value oil into methyl fatty ester and molecular distilling to refine, and has raised reaction efficiency, short reaction time, product purity over 98 %, recovery of side product glycerin and low technological cost.

The invention relates to a method for synthesizing low acid-value fatty acid methyl ester by esterification reaction and aims at providing the method with the characteristics that a process is simple; a catalyst and a product are easy to separate and can be recycled; the reaction conversion rate is high; and the obtained fatty acid methyl ester has low acid value. The method for preparing the lowacid-value fatty acid methyl ester sequentially comprises the following steps of: 1, feeding fatty acid and a resin catalyst together or feeding the fatty acid and a solid acid catalyst together, andthen heating the mixture with stirring; 2, after a temperature of a reaction system is raised to 50 to 80 DEG C, dropwise adding methanol into the reaction system, distilling the methanol and water generated in the reaction process, sampling and monitoring the reaction conversion rate in the reaction process and finishing the reaction until the acid value reaches below 0.5mgKOH/g, wherein the pressure of the reaction system is in the range of 10 to 101Kpa and the reaction time is in the range of 4 to 6 hours; and 3, after finishing the reaction, filtering out the catalyst, carrying out reduced pressure distillation on filtrate to separate out excessive methanol and water to obtain a finished product and directly recycling the resin catalyst or the solid acid catalyst.

The invention relates to an acid-proof type microalgae DHA oil microcapsule powder and a preparation method thereof. The acid-proof type microalgae DHA oil microcapsule powder is prepared from 12.6%-30.3% of core materials and 69.7%-87.4% of wall materials, concretely comprising the following active ingredients in percentage by weight: 12.5%-30.0% of microalgae DHA oil, 0.1%-0.3% of antioxidant, 25.0%-50.0% of whey protein, 3.0%-8.0% of food emulsifier, 20.0%-54.4% of sweetener, 4.40%-8.0% of hydrophilic colloid, and 0.60%-1.20% of acidity regulator. The prepared acid-proof type microalgae DHA oil microcapsule powder has good acid-proof property, and can be applied in a food system of an acid water system with pH of more than or equal to 3.5, the oxidization speed of microalgae DHA can be effectively reduced and delayed, the activity of the microalgae DHA can be maintained, the stability of microalgae DHA in acid water system food can be enhanced, and the shelf life of the acid water system food with microalgae DHA can be prolonged.

The invention relates to a method for preparing maize germ oil through enzymatic degumming. Specifically, phosphatidase is employed for a degumming treatment of maize crude oil during the refining process. Then after deacidification, decoloration, dewaxing and deodorization, refined maize germ oil can be obtained. Wherein, the degumming treatment comprises acid reaction, alkali neutralization, enzyme reaction, and separation, dehydration and drying; the acid in the acid reaction is citric acid, and the enzyme in the enzyme reaction is phosphatidase. In the invention, the key technology for maize germ oil refining is overcome, and the optimum technological conditions for the enzymatic degumming of maize germ oil are optimized. The maize germ oil prepared through enzymatic degumming has the obvious advantages of: low operation temperature and low energy consumption; obviously superior quality of the obtained oil to the quality of oil prepared by traditional methods, and increased product oil yield by over 1%; reduced consumption of acid and alkali chemicals, and reduced waste water generation by 70%-90%, substantially reduced environmental protection cost and markedly improved economic benefit.