86 results about "1,3-Butadiene" patented technology

2,3-BDO is important industrial chemicals and a medicinal precursor, for example, the 2,3-BDO can form 1,3-butadiene through dehydration and can be used for synthesizing rubber, polyester and polyurethane; the esterified 2,3-BDO is a precursor of synthetic polyimine, and can be applied to medicaments, cosmetics, washing liquor liquid and the like; and in addition, the 2,3-BDO can also be used as a flavor substance to be added into distilled spirit and cream. The 2,3-BDO can be prepared by a chemical synthesis method and a microorganism production method, and due to a special structure of 2,3-butanediol, in the chemical method for producing the 2,3-butanediol, the 2,3-butanediol is mainly prepared by hydrolyzing four-carbon hydrocarbon generated during the splitting decomposition of petroleum at the high temperature and under the high pressure and has the disadvantages of high cost, complicated processes and difficult operation, so the large-scale industrial production is difficult to realize all the time. With the increasing rise in oil price, people pay close attention to the production of the 2, 3-butanediol by using the microbial fermentation method and the developmental research of derivatives thereof gradually. The fermentation method for producing the 2,3-butanediol has the following advantages that: firstly, the fermentation method has the superiority in cost, and the chemical method has high production cost; secondly, the fermentation method has an environmental-friendly characteristic, and the 2,3-butanediol is used as an organic synthesis intermediate to occupy markets of a number of compounds and other petroleum chemicals, has wide prospect, obvious social and environmental benefits, and is particularly favorable for the extensive application of the products; and thirdly, in the fermentation method for producing the 2,3-butanediol, renewable resources are used as raw materials, so the fermentation method does not depend on the petroleum chemicals.

The invention discloses a solid-and-liquid attitude-control rocket engine. The solid-and-liquid attitude-control rocket engine comprises an oxidizing agent conveying system, a direct-action solenoid valve, a honeycomb-type catalytic bed, a combustion chamber and a spraying pipe, wherein the conveying system is used for supplying hydrogen peroxide by adopting a nitrogen extrusion mode; the supplying amount of the hydrogen peroxide is controlled by the direct-action solenoid valve, so that rapid response of the solid-and-liquid attitude-control rocket engine can be realized; the honeycomb-type catalytic bed is adopted for catalyzing, and an oxidizing agent is resolved to generate high-temperature oxygen which enters the combustion chamber through a spraying and jetting panel; and six passages are formed in the middle part of an end-burning grain, and the high-temperature oxygen reaches a grain section through the above passages and generates action with 1-3 butadiene which is a product of decomposition of HTPB, so that the engine starts to work. According to the solid-and-liquid attitude-control rocket engine, double-mode work is adopted, and the advantages of a single-unit attitude-control rocket engine of simple structure and high reliability and the advantages of a double-unit attitude-control rocket engine of high specific impulse and rapid switching-on and switching-off are combined; besides, the structure is simple; cost is low; safety is high; and the solid-and-liquid attitude-control rocket engine is environment-friendly.

The invention provides a method for preparing polybutadiene, which comprises: adding a 1,3-butadiene monomer and a catalyst into an alkane solvent in a molar ratio of 100-4,000:1 to perform polymerization to obtain reaction solution; and extracting polybutadiene from the reaction solution by using ethanol. A method for preparing the catalyst comprises: mixing a rare earth compound, butadiene, isoprene and alkylaluminium to perform a reaction to obtain a mixed solution; adding a chloride into the mixed solution to perform a reaction to obtain the catalyst. In the invention, the rare earth compound three-component homogeneous phase catalyst is used for catalyzing the reaction and part of the 1,3-butadiene monomer is pre-polymerized to serve as part of the catalyst, so an active center of the reaction is formed to stabilize polymerization; and by controlling the molar ratio of the 1,3-butadiene monomer to the catalyst, the polybutadiene with low molecular weight and narrow molecular weight distribution is prepared.

Provided are: a rubber composition that improves fuel economy and wet grip performance together while maintaining the balance between them; and a pneumatic tire whose component (in particular tread) includes the rubber composition. The invention relates to a rubber composition containing: a rubber component containing a copolymer; silica; and a diene rubber gel bearing a hydroxyl group, wherein the copolymer is obtained by copolymerization of 1,3-butadiene, styrene, and a compound represented by formula (I) below, has an amino group at a first chain end and a functional group containing at least one atom selected from the group consisting of nitrogen, oxygen, and silicon at a second chain end, and has a weight average molecular weight of 1.0×10⁵-2.5×10⁶, and the diene rubber gel has a Tg of −40 to −10° C., and is present in an amount of 10-30 parts by mass per 100 parts by mass of the rubber component;

The invention relates to a rare-earth modified zinc-iron composite oxide catalyst, a method for preparing the rare-earth modified zinc-iron composite oxide catalyst, and an application of the rare-earth modified zinc-iron composite oxide catalyst in preparing 1,3-butadiene. Specifically, the invention relates to the rare-earth modified zinc-iron composite oxide catalyst which is generated from an alkali solution by using a coprecipitation method, wherein the composite oxide catalyst is used for producing the 1,3-butadiene with high additional values by adopting the butene as a reactant. Due to adoption of the composite oxide catalyst, the yield of the 1,3-butadiene is higher than that of the conventional ferrate (ZnFe2)4), and the temperature for reaction is low.

The invention discloses a process flow for producing 1,3-butadiene by performing oxidative dehydrogenation on butylene. A major secondary reaction in the butylene oxidative dehydrogenation process is a deep oxidation reaction of butylene and 1,3-butadiene serving as a product thereof, and carbon monoxide, carbon dioxide and oxygen-containing compounds such as aldehyde, copper, acid and the like are mainly generated in the reaction. A catalyst industrially used in the oxidative dehydrogenation process of butylene consists of bismuth molybdate, multi-component molybdate, oxides of tin and antimony, tin and phosphorus and the like, and ferrite, ferric chromate and the like. In the process, an appropriate oxygen/butylene ratio is controlled, the oxygen content of tail gas is controlled, and the residual oxygen in a reactant is 0.3-0.5 percent (volume fraction). The production method is one of the best methods for preparing high-purity 1,3-butadiene.

The invention discloses a method for preparing beta-phenethyl alcohol. According to the method, acetic acid-3-butene-1-alcohol ester and 1,3-butadiene are adopted as raw materials, and the preparation of beta-phenethyl is finished by adopting Diels-Alder, hydrolysis and dehydrogenation reactions. lewis acid supported by fullerol as a carrier is adopted as the catalyst for the Diels-Alder reaction, the atom utilization rate is high, the total yield can reach 87%-95%, the purity of products can reach 99.92wt%-99.98wt%, and an oxidation reaction process and a high-pressure hydrotreatment reaction process are not adopted, so that the production process is safe and environmentally friendly.

The invention discloses a method for catalyzing selective hydrogenation of 1,3-butadiene with a PdAgNi/N-C catalyst. The method is characterized by comprising the following steps: firstly, putting a PdAgNi/N-C catalyst into a tubular reactor, increasing the temperature of a catalyst bed layer to 30-60 DEG C, further introducing a mixed gas of 1,3-butadiene and hydrogen into the reactor, and carrying out a reaction at pressure of 1.5-3.2MPa and an air speed of 1.0-4.0hour<-1>. By adopting the method, PdAgNi/N-C is adopted as a catalyst, selective hydrogenation of 1,3-butadiene is carried out with the catalyst, the content of 1,3-butadiene in a product is less than 900ppb, the content of butane is less than 2.3%, and high catalysis activity can be still maintained after the catalyst is continuous operated for 100 hours.

The invention provides a catalyst composition for preparing 1,2-polybutadiene. The catalyst composition comprises alkyl aluminum, and iron complex with the chemical formula shown as a formula (I): [Fe(CF3SO3)x(L)y], wherein L is ligand which is a phosphorus compound, a nitrogenous compound, a sulfur compound, or an oxygen compound; x is 2 or 3; and y is more than or equal to 1 and less than or equal to 10. The catalyst composition has high catalytic activity at high temperature, has a wide application temperature range, and can be produced industrially. The invention also provides a preparation method for the 1,2-polybutadiene. The preparation method comprises the following steps of: performing polymerization on 1,3-butadiene in an organic solvent under the action of the catalyst composition for preparing the 1,2-polybutadiene to obtain the 1,2-polybutadiene. A small amount of the catalyst composition is adopted in the preparation method, a preparation process is stable, a reaction condition is mild, and the method is easy to operate and low in production cost.

The invention discloses a benzisoxa thiazole compound which is used as a double-function inhibitor of 5-lipoxygenase (5-LOX) and prostaglandin E synthetase (mPGES-1), and the compound has the structure shown in the formula IV, wherein, R1, R2 and R3 represent hydrogen, alkyl, alkyloxy or halogen respectively, or R2 and R1 or R3 form a ring, thereby representing 1, 3-butadiene subunit. The external and whole blood enzyme activity test of the compound for 5-LOX and mPGES-1 confirms that the compound has the double-function inhibition activity for 5-lipoxygenase and prostaglandin E synthetase, and can be used for preparing medicaments for treating and preventing various inflammations.

The invention relates to a method for preparing a syndiotactic poly1,2-butadiene thermoplastic elastomer, which comprises the following steps: initiating the polymerization of 1,3-butadiene monomer in hexane solution of a synthetic rubber through the addition of 1,2-configurational units by using iron catalysts to form a uniform blend of 1,2-butadiene and synthetic rubber, wherein the catalysts comprise iron isooctanoate or iron naphthenate, diethyl phosphate, triisobutyl aluminium and aluminium triethyl; the adding sequence of the catalysts is that any components are combined or two aluminum alkyls are mixed first and then combined with the other two components optionally; in a polymerization system, every 1,000 millilitres of hexane solution contains 90 to 140 grams of 1,3-butadiene monomer, and the adding amount of the rubber is 0.1 to 25 grams; and the polymerization initiating temperature is 60 to 90 DEG C. The blend has the properties of the typical thermoplastic elastomers and can be used for modifying thin films, shoe soles, tubular materials, rubbers and plastics.

In the disclosed method for producing polybutadiene by means of anionic polymerization at a low temperature, polybutadiene having diverse physical properties is produced by means of controlling the microstructure thereof. The method for producing polybutadiene by means of anionic polymerization from 1,3-butadiene under the presence of a polymerization initiator and under reaction temperature conditions no higher than the boiling point of butadiene is characterized by being performed under the presence of a potassium salt in an aprotic polar solvent or a mixed solvent of an aprotic polar solvent and a nonpolar solvent. The potassium salt is preferably potassium t-butoxide, and the solvent is preferably a mixed solvent of tetrahydrofuran and hexane. The polybutadiene obtained thereby can be used in an adhesive composition and in a plate production material composition used in flexographic printing plates.