896results about "Ether preparation from oxiranes" patented technology

In a composite process for subjecting ethylene to catalytic gas phase oxidation thereby obtaining ethylene oxide and causing this ethylene oxide to react with water thereby obtaining ethylene glycol, a method for producing the ethylene glycol is provided which permits effective utilization of the energy at the step for dehydrating and concentrating the resultant aqueous ethylene glycol solution. In the production of ethylene glycol by the supply of the aqueous ethylene glycol solution to a concentrating treatment at the multi-effect evaporator, the method contemplated by this invention for the production of ethylene glycol comprises utilizing as the source of heating at least one specific step the steam generated in the multi-effect evaporator.

A process is provided for the start-up of an ethylene epoxidation process comprising: (a) contacting a catalyst bed comprising a high selectivity epoxidation catalyst with a feed comprising ethylene, oxygen and an organic chloride for a period of time until an increase of at least 1×10⁻⁵ mole-% of vinyl chloride (calculated as the moles of vinyl chloride relative to the total gas mixture), preferably 2×10⁻⁵ mole-% of vinyl chloride is detected in a reactor outlet gas or a recycle gas loop; and (b) subsequently adjusting the quantity of organic chloride in the feed to a value sufficient to produce ethylene oxide at a substantially optimum selectivity.

The invention provides vinyl polyether. The structure of the vinyl polyether is expressed in the following formula (1), wherein R1 represents C1 to C8 alkylene; R2 represents hydrogen or C1 to C3 alkyl; a and b are integers in the range of 2 to 4 and are unequal; n is an integer in the range of 0 to 100; m is an integer in the range of 0 to 100; and the sum of n and m is more than or equal to 3 and is less than or equal to 100. A polyether monomer has good polymerization activity and molecular structure controllability. The invention also provides a preparation method of the vinyl polyether and application of the vinyl polyethe to the synthesis of high molecular polymers such as a concrete poly carboxylic acid water reducing agent, a water treatment agent, a macromolecule surfactant or various resins and the like.

A method for synthesizing propylene glycol methyl ether relates to a method for synthesizing propylene glycol methyl ether. The method of the invention settles the problems of high reaction temperature, high pressure, low activity of catalyst and low selectivity existing in the prior method for preparing propylene glycol methyl ether. The method comprises the following steps: 1. preparing a compound A; 2. preparing a compound B; and 3. after naturally cooling the mixed solution B to a room temperature, atmospherically distilling and obtaining the propylene glycol methyl ether. The method of the invention has the advantages of simple process, applicable whole reaction in the condition of normal pressure and low-temperature, 93.3%-94.2% of epoxy propane conversion rate, 98.1%-99.1% of product selectivity, and no environment pollution as the whole reaction process is executed under the condition of no dissolvent. The propylene glycol methyl ether (1-methoxy-2-propanol or 2-methoxy-1-propanol) synthesized according to the invention can be synthesized by regulating the mixed liquid of acetate methyl glyoxaline hydroxide or acetate methyl glyoxaline chloride and ferric trichloride.

The invention provides cardanol polyoxyethylene ether and a preparation method thereof. The cardanol polyoxyethylene ether is prepared by reacting cardanol and epoxy ethane. The method comprises the following steps of: adding a catalyst and the cardanol into a reaction kettle during a reaction; fully stirring at the temperature of between 150 and 180 DEG C; introducing the epoxy ethane into the reaction kettle; performing polyreaction with stirring; adding acetic acid after the reaction for neutralization; and discharging after cooling so as to obtain the cardanol polyoxyethylene ether. The cardanol polyoxyethylene ether and the preparation method thereof have the advantages of a small number of side reactions, good color and luster of a product, mild reaction condition and low cost of raw materials. Natural cardanol is taken as a raw material for producing, so that the adverse effect of alkylpheol ethoxylates synthesized from petroleum on the environment is avoided. The cardanol polyoxyethylene ether belongs to linear chain alkylpheol ethoxylates and the hydrophile-lipophile balance (HLB) of a nonionic surfactant can be controlled by adjusting the adduct number of the epoxy ethane according to a process, so that the cardanol polyoxyethylene ether can be taken as an emulsifier, a lubricant, a washing agent, a solubilizing agent and the like.

Quaternary ammonium, betaine, or sulfobetaine compositions derived from fatty amines, wherein the fatty amine is made by reducing the amide reaction product of a metathesis-derived C₁₀-C₁₇ monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives and a secondary amine, are disclosed. Quaternary ammonium, betaine, or sulfobetaine compositions derived from fatty amidoamines, wherein the amidoamine is made by reacting of a metathesis-derived C₁₀-C₁₇ monounsaturated acid, octadecene-1,18-dioic acid, or their ester derivatives and an aminoalkyl-substituted tertiary amine, are also disclosed. The quaternized compositions are advantageously sulfonated or sulfated. In one aspect, the ester derivative of the C₁₀-C₁₇ monoun-saturated acid or octadecene-1,18-dioic acid is a lower alkyl ester. In other aspects, the ester derivative is a modified triglyceride made by self-metathesis of a natural oil or an unsaturated triglyceride made by cross-metathesis of a natural oil with an olefin. The quaternary ammonium, betaine, and sulfobetaine compositions and their sulfonated or sulfated derivatives are valuable for a wide variety of end uses, including cleaners, fabric treatment, hair conditioning, personal care (liquid cleansing products, conditioning bars, oral care products), antimicrobial compositions, agricultural uses, and oil field applications.

The invention discloses a preparation method of isopentenol polyoxyethylene ether. Isopentenol and ethylene oxide are served as raw materials; in the presence of catalyst, the raw materials react for 5-40 hours to obtain the isopentenol polyoxyethylene ether at the reaction temperature of 70-160 DEG C. The isopentenol polyoxyethylene ether has the molecular weight of 200-6000 and the iodine value of 3.9-123; the mass ratio of isopentenol to ethylene oxide in the raw materials is 1:0.0143-0.754; and the mass of the catalyst is 0.03-0.5% of total mass of the raw materials of isopentenol and ethylene oxide. The invention has simple and reasonable technology. Because the invention has the structural particularity of branched chain methyl, molecular space steric hindrance is increased, and the composite polycarboxylic acid high-efficiency water reducer has strong cement particle dispersibility holding capacity. Thus, the product has the advantages of low dosage, high water-reducing ratio, good strengthening effects, good durability and the like, does not erode reinforcing steel bars and protects environment.

A process for preparing regioselectively an optically active 1-halogeno-2-hydroxypropyl compound of the following formula;

• • wherein X is halogen atom and Nu is a heteroatom having a substituent,

and an optically active glycidyl compound of the formula;

which comprises reacting an optically active epihalohydrin of the formula;

with a neucleophilic agent,

in the presence of a metal complex of the formula;

wherein n is an integer of 0, 1 or 2, Y¹, Y² and Y³ are hydrogen atom, etc., and Y² and Y³ may form a ring such as benzene, A is a counterion and M is a metal ion, and further subjecting the compound (4) to reaction with a base to prepare the optically active glycidyl compound (5).

A process for preparing an epoxidation catalyst comprising silver and a high-selectivity dopant on a support, which process comprises

• • depositing a base having a pK_b of at most 3.5 when measured in water at 25° C., on the support prior to depositing silver on the support, and depositing silver and a high-selectivity dopant on the support; the epoxidation catalyst; and a process for preparing an olefin oxide by reacting an olefin with oxygen in the presence of the epoxidation catalyst.

The invention discloses a method for preparing methyl allyl alcohol polyoxyethylene ether. In the method, methallyl alcohol and ethylene oxide undergo a polymerization reaction in the presence of a catalyst to form the methyl allyl alcohol polyoxyethylene ether. The catalyst is sodium methyl allyl alcohol or potassium methyl allyl alcohol; the molar charge ratio of the methallyl alcohol to the ethylene oxide is 1.0:(5.0-78.0); the amount of the catalyst is 0.10 to 0.60 weight percent based on the methallyl alcohol; and the reaction pressure is 0.10 to 0.40MPaG, the reaction temperature is 50 to 150 DEG C, and the reaction time is 3 to 7 hours. The key technical point of the method is that the instauration of the product is increased by over 10 percent by using the more ideal catalyst. The method can be used for preparing methyl allyl alcohol polyoxyethylene ethers with a weight-average molecular weight of 150 to 6,000.

The invention discloses a method for preparing ethylene glycol phenyl ether, propylene glycol phenyl ether and butylene glycol phenyl ether, comprising the following steps: 1) firstly, adding phenyl into a reaction kettle, introducing inert gas and adding catalyst, then adding ethylene oxide or propylene oxide or butylene oxide, reacting under the conditions that the temperature is at 70-140 DEG C and the pressure is less than 1 MPa, thereby generating the crude product of ethylene glycol phenyl ether or propylene glycol phenyl ether or butylene glycol phenyl ether, wherein the mol ratio of the added phenyl to the added ethylene oxide or propylene oxide or butylene oxide is 1:0.6-1; and 2) reducing pressure and distilling the prepared crude benzene under the conditions that the vacuum degree is not less than 0.07MPa and the temperature is at 80-110 DEG C, thereby obtaining the product of ethylene glycol phenyl ether or propylene glycol phenyl ether or butylene glycol phenyl ether. The product of ethylene glycol phenyl ether or propylene glycol phenyl ether or butylene glycol phenyl ether prepared by the invention has a purity more than 99%, and does not need to be rectified and purified; and the method has the advantages of low equipment investment, convenient maintenance, simple operation control, low comprehensive cost and the like, and has considerable economic benefit.

Bimaleimide resin toughening modifiers and a preparation method thereof are disclosed. The preparation method comprises: taking diallyl bisphenol A as the basis, carrying out etherification reaction by using a series of etherification reagents mainly comprising polyhydric alcohols, epoxy compounds, chlorohydrins, choroethers or the like, and reacting 20 parts by mass of diallyl bisphenol A and 15.0-72.0 parts by mass of the ether reagents, under catalysis of 2.2-8.8 parts by mass of an alkali (or an acid), at 60-150 DEG C for 1-10 h, to obtain a series of novel bimaleimide resin modifiers. The modifiers have good solubilizing and toughening effects on BMI bimaleimide resins without inhibition, and accurate control solidification of the bimaleimide resins is easy to realize in a use process.

The invention discloses a vegetable oil polyalcohol with a high hydroxyl value as well as a preparation method and an application of the vegetable oil polyalcohol. The vegetable oil polyalcohol is prepared by carrying out ring-opening reaction and transesterification reaction on epoxy vegetable oil and a polyhydroxy compound. Compared with the prior art, the vegetable oil polyalcohol prepared by adopting a novel ring-opening reagent is novel in structure, high in hydroxyl value, relatively uniform in hydroxyl value distribution, high in primary hydroxyl content, short in suspension chain, low in viscosity and capable of completely substituting the traditional petrochemical polyalcohol to be applied to preparation of a polyurethane foam material. Meanwhile, the preparation method disclosed by the invention is simple in process; the obtained vegetable oil polyalcohol does not need to be after-treated and is very suitable for industrial production; and particularly, after a tubular reactor is selected, the reaction efficiency can be increased, the side reaction can be controlled, and the energy consumption can be reduced.

The invention relates to saturated cardanol polyoxyethylene ether and a preparation method thereof, which belongs to the technical field of organic synthesis, and the structural formula of the saturated cardanol polyoxyethylene ether is as follows, wherein n=2-30. The preparation method comprises the following steps: performing a hydrogenation reaction of cardanol; performing filtration and distillation, and performing an addition reaction with ethylene oxide; adjusting the pH value, filtering, and performing reduced-pressure distillation; or performing an addition reaction of cardanol and ethylene oxide; adjusting the pH value, filtering, performing a hydrogenation reaction, filtering, and performing reduced-pressure distillation. The preparation method of the invention uses cardanol as a raw material, and prepares cardanol polyoxyethylene ether with different ethylene oxide adduct numbers and saturated side chains; the product does not contain mixed unsaturated double bond structures, has surface activity, and has stable using performance.

The present invention relates to processes for preparing ethylene oxide (EO)-capped polyols in which removal of catalyst residues or salts formed by the neutralization of the basic catalyst is not required prior to discharging the polyol from the reactor because neutralization occurs during or after the starter charge of a subsequent batch. The inventive processes allow for the preparation of DMC-catalyzed intermediates and their base-catalyzed EO caps within the same reactor. Polyols produced by the processes of the invention have a high content of primary hydroxyl groups and may be useful for producing polyurethane foams, elastomers, sealants, coatings, adhesives and the like.

The invention provides a method for degrading and recycling an unsaturated polyester resin material. The method comprises the following steps: preparing a reaction solution by a catalyst and a reaction solvent; mixing the reaction solution with an unsaturated polyester material to prepare an unsaturated polyester degrading system; heating the prepared unsaturated polyester degrading system for degradation; adding a separation solvent into the cooled unsaturated polyester degrading system; filtering to obtain solids, namely enhanced fibers and a catalyst; drying and sieving, and recycling; adding water into filtrate so as to separate out a polymer degrading component containing a styrene structure, and filtering; drying and recycling the filtered polymer solids containing the styrene structure; and evaporating filtrate to obtain substances mainly comprising resin degraded products which do not contain the styrene structure. The method for degrading and recycling the unsaturated polyester resin material has the advantages of low cost, moderate recycling conditions and high degrading activity.

To provide a method of producing a polyether polyol having less coloration with good selectivity and high efficiency by dehydrocondensing a polyol. In producing a polyether polyol by dehydrocondensation reaction of a polyol, a solid acid catalyst satisfying at least one of the following requirements (1) to (3) is used:

• • (1) Acid function H₀ measured by Hammett's indicator adsorption method is larger than −3; (2) In Temperature-Programmed Desorption (TPD) analysis of ammonia, desorption amount of ammonia in a region of from 100 to 350° C. is 60% or more of the entire ammonia desorption amount (a region of from 25 to 700° C.); and (3) In thermogravimetry (TG), desorption amount of water is 3% by weight or more of a reference weight in a region of from 32 to 250° C.