653 results about "Tert-Butanol" patented technology

Isobutene is prepared by dissociating tert-butanol into isobutene and water over an acid ion-exchange resin arranged as a fixed bed in at least one reactor at a temperature of from 80 to 150° C. and at a pressure of from 5 to 25 bar to obtain a reaction mixture, separating the reaction mixture into isobutene, a by-product, water and at least one mixture of undissociated tert-butanol and water. The reactor is operated pseudo-isothermally, with a temperature difference between inflowing and outflowing streams of less than 15 K.

The invention relates to a method for hydrogenation preparing isobutyraldehyde and isobutyl acohol from methacrolein. The method comprises using a supported metal catalyst, and hydrogenating methacrolein obtained by oxidating isobutene under gentle conditions. The invention provides a novel synthesis process for hydrogenation preparing isobutyraldehyde and isobutyl acohol from methacrolein which is obtained by air-oxidating low-utilization C4 material isobutene or tert-butanol. The methacrolein conversion rate is larger than 98%, the total selectivity of isobutyraldehyde and isobutyl acohol is larger than 95%, the performance of the catalyst is stable even the reaction lasts more than 1000 hours. The invention has the advantages of high activity and high selectivity of catalyst, good stability of catalyst, cheap material isobutene, low productin cost of isobutene, environment-protecting process, and suitability of industrialisation production. The process is flexible, can change the proportion of isobutyraldehyde and isobutyl acohol through adjusting the reaction process condition, thereby cogenerating isobutyraldehyde and isobutyl acohol, or only generating isobutyl acohol by cycling and hydrogenating isobutyraldehyde.

The invention discloses a blocking remover for a reservoir of an oil well. The blocking remover is applied to the technical field of oil extraction in an oil field, comprises an agent A and an agent B, and is characterized in that the weight percentage of the agent A is 25-35%; the weight percentage of the agent B is 65-75%; the agent A comprises the following components by weight: 45-50% of petroleum mixed xylene, 1-2% of nonyl phenol polyoxyethylene (4) ether, and the balance of 0# diesel oil; the agent B comprises the following components by weight: 6-10% of glacial acetic acid or sulfamic acid, 2-2.5% of ammonium bifluoride, 2% of ammonium chloride, 1-2% of citric acid, 1.5-2% of corrosion inhibitor 7801, 3-5% of tertiary butanol, 0.5-1% of octyl phenol polyoxyethylene (10) ether and the balance of water. The blocking remover has the following effects that: the agent A and the agent B are respectively prepared so as to be beneficial to storing the blocking remover for a long time, the agent A of the blocking remover has strong dissolving capacity on crude oil heavy components, such as wax colloid asphalt, and the washing oil efficiency on oil sand is more than 90%. The dissolving rate of the agent B of the blocking remover on carbonate is more than 80%, and the corrosion speed on N80 steel is low and is smaller than 2 g/m<2>.h.

The invention discloses a pyridine quaternary ammonium salt type halamine antibacterial agent with a structure represented by a general formula I, wherein n is an integer of 1-10. The preparation method comprises the following steps: a, 5,5-dimethyl hydantoin is placed in an acetone solution doped with anhydrous potassium carbonate; refluxing is carried out for 30min, and dibromoalkane is added; refluxing is continued for 4h, such that a bromo-alkyl hydantoin compound is obtained; b, the obtained bromo-alkyl hydantoin compound is dissolved in acetonitrile; excessive pyridine is added; heating and refluxing are carried out overnight; concentration is carried out, such that a pyridine bromide quaternary ammonium salt type halamine precursor is obtained; the precursor is delivered through chlorine-type anion exchange resin, such that a pyridine chloride quaternary ammonium salt type halamine precursor is obtained; and c, the obtained pyridine chloride quaternary ammonium salt type halamine precursor is dissolved in a mixed solution composed of deionized water and tert-butanol; tert-butyl hypochlorite is added, and stirring is carried out for 2-4h while protected from light, such that the pyridine quaternary ammonium salt type halamine is obtained. The method has the advantages of easy-to-obtain raw materials, and relatively simple synthesis method. The method has a prospect of industrialized application.

The co-solvent composition for compounding methanol gasoline consists of methyl tert-amyl ether 0-61 weight portions, dimethyl carbonate 0-52 weight portions, methyl tert-butyl ether 0-47 weight portions, allcyl polyoxyethylene ether 0.1-10 weight portions, isopropyl ether 0-10 weight portions, ethyl ether 0-30 wt%, tert-butanol 0-45 weight portions, iso-butanol 0-25 weight portions, isopropanol 0-15 weight portions, antioxidant í‹501íŒ 0-8 weight portions, xylene 0-20 weight portions, urotropin 0-7 weight portions, butanone 0-36 weight portions and acetone 0-20 weight portions. It is added while compounding methanol gasoline to raise the intersolubility between methanol and gasoline and raise the relevant physical and chemical performances of methanol gasoline.

The present invention relates to a process for separating 2-butanol from tert-butanol/water mixtures using a membrane to reduce a water concentration to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/water and SBA/water and is subsequently worked up by distillation.

A process for preparing tert-butyl hydroquinone (TBHQ) includes such steps as dewatering alkylation reaction between hydroqainone and tert-butanol under catalysis of acid to obtain TBHQ, and purifying by reducing agent and acid.

The invention discloses a preparation and an application of a porous ZSM-5 zeolite molecular sieve aggregate. The preparation is characterized in that by adopting silicon-aluminum sol-gel, which is synthesized by an inorganic aluminum source and an organic silicon source, and added with seed crystal prepared by tetra propyl ammonium, as a guiding agent, the porous ZSM-5 zeolite molecular sieve aggregate with an open pore duct is synthesized through one-step process. The aggregate is taken as a catalyst for hydroxylation reaction of cyclohexane, tertiary butanol and phenol. Compared with the prior art, the aggregate structure, which is formed by stacking nano particles with particle size of 20-150 nm, has a specific surface area up to 600 m<2>/g, total pore volume up to 0.8cm<3>/g, and high conversation rate and selectivity, keeps the activities of monodisperse nano particles, effectively solves the problem that the nano particle catalyst is difficult to separate and short in service life in phenol hydroxylation reaction, and has a certain industrial popularization and application prospect and a remarkable economic value.

A process for preparing the liposome of medicine includes such steps as dissolving the lipid in tert-butanol, dissolving the medicine in water, proportional mixing, freeze drying, and hydrating. Its advantages are simple process and high stability.

The invention discloses the modifying method for cellulose ether product, comprising: mixing the reaction raw material with solvent and getting the product, then washing, drying and breaking the product, the solvent used in the reacting and washing course is water, alcohol isopropylicum and butyl alcohol; or water, alcohol isopropylicum and isobutyl alcohol; or water, alcohol isopropylicum and tert-butanol. The invention is characterized by the little pollution to environment, high reaction efficiency, easy to remove solvent and high efficiency for product washing, which effectively improves the quality of cellulose ether product such as hydroxypropyl cellulose (HPC), hydroxypropylmethylcellulose (HPMC),glycol cellulose (HEC), cellulose ethyl ether (EC) and cationic cellulose.

The invention relates to a preparation method of a liposome entrapping water-soluble medicines. According to the invention, a water-soluble medicine is dissolved in amino-acid-structure-containing high-molecular hydrophilic colloids such as gelatin, collagen or albumin; poloxamer is added and the mixture is well mixed, such that a W/W type colloidal solution is formed; the solution is lyophilized; the formed lyophilized powder is transferred into a tert-butanol solution containing a liposome material, and the mixture is well dispersed; and the mixture is subjected to lyophilization, such that high-entrapment-efficiency liposome entrapping the water-soluble medicine is formed. According to the liposome preparation method, W/W type colloid is combined with a two-step lyophilization preparation technology, such that problems such as low water-soluble medicine load, low entrapment efficiency and poor stability of existing preparation methods of liposome entrapping water-soluble medicines are solved. The method provided by the invention is used for preparing liposome used for entrapping water-soluble medicines, and is especially suitable for preparing liposome used for entrapping poor-thermal-stability or macromolecular medicines. The method can also be used for covering medicine bitterness or odor, and for separating medicines from other components.

The invention discloses a preparation method of a nickel oxide-carbon nitride composite photocatalyst. The preparation method comprises the steps: firstly, calcining urea under a certain condition toobtain carbon nitride powder; then, carrying out ultrasonic dispersion at a certain temperature, dispersing the carbon nitride powder into tert-butanol with a certain volume, then, adding a certain amount of nickel acetylacetonate into a mixed solution, and carrying out ultrasonic dispersion and continuous magnetic stirring to obtain a precursor solution; and finally, carrying out a solvothermal reaction on the precursor solution to obtain carbon nitride nanopowder of which the surface is modified with nickel oxide nanoparticles. The preparation method has the advantages that: (1) compared with other methods, the method is simple in process, free of complex equipment and harsh environments and low in cost; (2) the loading amount of the nickel oxide nanoparticles on the surface of carbon nitride can be conveniently controlled by using the method; and (3) the nickel oxide-carbon nitride composite photocatalyst prepared by using the method has excellent photocatalytic hydrogen production,and the hydrogen production amount of the catalyst is obviously increased after the nickel oxide nanoparticles are loaded.

The invention discloses a ethyl lactate synthesis enzyme catalysis method in solvent phase and belongs to ethyl lactate preparation technology using lactic acid and ethanol, characterizing in the following steps: using chloroform, tert-butanol or tetrahydrofuran as sovent, or adding in the said solvent of lactic acid and ethanol in ratio of (1:5)-(1:10) and lipase according to 10-30 g enzyme catalysis per mol lactic acid, mixing sufficiently, constant temperature water bath in 60-70 DEG C while lactic acid concentration is 0.3-0.6mol/L, concussion table revolution being controlled 200-250revolution/min, reacting 24-48 hours, obtaining crude products containing ethyl lactate. Advantage of the invention compared with existing ethyl lactate preparation method lies in: temperate reaction condition, low energy consumption, easy operation of separating catalyst and products, apparatus not easy corroding, no pollution, high product quality and yield.

The invention relates to an ether production technology and especially relates to a method and production device for preparing methyl tertiary-butyl ether (MTBE) by a reaction of tertiary butanol and methanol. The method comprises that tertiary butanol and methanol are mixed and undergo a reaction to produce mixed gas, the mixed gas is fed into an extraction tower and is extracted, isobutene and MTBE are distilled off from the tower top, tertiary butanol, methanol, a trace amount of MTBE, water and an extractant flow out of the tower bottom, methanol is supplied for a tower top component of the extraction tower, the mixture is fed into a catalytic distillation tower, a methanol- and isobutene-containing tower top product of the catalytic distillation tower is fed back to a reactor and then undergoes a reaction, the MTBE is discharged from the bottom of the catalytic distillation tower, the materials discharged from the bottom of the catalytic distillation tower enters into a first extractant recovery tower, tertiary butanol, methanol and a trace amount of MTBE are distilled off from the top of the first extractant recovery tower, then are fed back to the reactor and then undergo a reaction, and the extractant and water flow out of the tower bottom, then enter into a second extractant recovery tower and then is recovered for recycle by reduced pressure distillation. The method and device solve the problem of azeotropy of tertiary butanol and water and improve a tertiary butanol one-step conversion rate to 87-94%.

The invention relates to a device and a method for separating tert-butyl alcohol from water by combining batch rectification and pervaporation. The device mainly comprises a rectification tower body, a rectification tower kettle, a condenser, a membrane separator, a water jet pump, a condensate storage tank and a circulating pump. The tert-butyl alcohol aqueous solution is added to the batch rectification tower kettle, and firstly total-reflux operation is carried out in the batch rectification tower by switching a valve positioned at the condensate outlet at the tower top; after the mixture in the tower becomes stable, azeotrope of the tert-butyl alcohol and the water enters the membrane separator by the condenser for further dehydration and separation; osmotic lateral pressure is kept at 1000Pa by the jetting of the water jet pump, thus the tert-butyl alcohol and the water in the tert-butyl alcohol aqueous solution are separated by the membrane separator; the high-concentration tert-butyl product can be obtained from the rectification tower kettle, and the water is vaporized at the downstream of the membrane separator by an osmotic membrane; after vaporization and condensation, the high-concentration tert-butyl product is put in the condensate storage tank, and then cooled by the condenser and sent to the water jet pump by the circulating pump for circulation. The method has the advantages of simple operations and high tert-butyl alcohol yield without adding other solvents.

The invention discloses a tert-butanol-water-cyclohexanone oxime differential-pressure rectification system. The system comprises high and low pressure rectification towers and corresponding kettle reboilers, a raw-material preheater, a pump, a condenser, a compression system and a reflux system. Tower-top steam in the high pressure rectification tower is used as a feedstock of the preheated low pressure rectification tower by setting the operation pressures of the high and low pressure rectification towers when the system is operated, so that the phase-change latent heat of the high-pressure rectification tower top steam is fully utilized. The kettle temperature is controlled by controlling the operation pressure of the high pressure rectification tower, and by controlling the low pressure rectification tower, the bubble point temperature of the high pressure tower top steam is higher than the feedstock temperature of the low pressure rectification tower by 0-50 DEG C. The steam at the tops of the towers are condensed, one part of the steam is sent to the corresponding rectification towers for refluxing, and the residue is sent to a kettle liquid area, and noncondensable gas in the system is compressed and sent out of the rectification system. The consumed steam amount of the differential-pressure rectification system is 40-55% of that of a single-tower rectification system.

The invention discloses a making technique of entikawei monohydrate as antiviral drug, which comprises the following steps: reacting cyclopentadiene monomer and sodium hydride protected by inert gas to make sodium cyclopentadiene; oxidizing through tert-butyl hydroperoxide; reacting with benzyl halogen under alkaline to obtain compound 3 to react with 6-benzyloxy guanine acted by alkaline to obtain compound 4; reacting with amino protective group to prepare compound 5; oxidizing through DMP tert-butanol oxidizing system to obtain ketone compound 6 to generate methylene compound 7 acted by Zn/TiCl4/CH2Br2; stripping protective product under acid condition to produce compound 8; recrystallizing to obtain the product.