64 results about "Isopentenol" patented technology

The invention discloses a staged delayed coagulation and viscosity reduction type iron aluminate cement water reducing agent and a preparation method thereof. The iron aluminate cement water reducing agent is obtained by copolymerizing prepared isopentenol polyoxyethylene ether borate, hydroxyethyl methylacrylate glucolactone and methacrylic acid. The boric acid ester is rapidly hydrolyzed in the initial stage of hydration (9 < pH < 12) to obtain boric acid, and first-stage delayed coagulation is performed on the aluminoferrite cement. When delayed coagulation fails, the cement continues to be hydrated to reach the middle stage of hydration (pH > 12), glucolactone is hydrolyzed to generate gluconate for further delayed coagulation of the cement, meanwhile, hydroxyethyl methylacrylate is hydrolyzed to release more adsorption sites, and hydration products are further dispersed to reduce the viscosity of the system. And stage release enables the aluminoferrite cement to be hydrated stage by stage, so that the problem of poor bleeding cohesiveness caused by non-hydration of the cement after one-time doping of the retarder is solved, the problem of slurry tackifying caused by large hydration of the cement in the later stage is also avoided, and engineering application of the aluminoferrite cement is further promoted.

The invention belongs to the technical field of building materials, and particularly relates to a silane modified starch-based polycarboxylate superplasticizer and a preparation method thereof. The water reducing agent is prepared by taking renewable sulfonated starch as a raw material, performing graft modification through vinyltriethoxysilane (A151), introducing active double bonds into starch molecules, and then copolymerizing with monomers such as isopentenol polyoxyethylene ether (TPEG) and acrylic acid. Compared with the prior art, the mixing amount of the vinyltriethoxysilane (A151) is only 1%-5% of the mass fraction of the acrylic acid, the mixing amount is low, and the cost is saved; the water reducing and dispersing performance of the starch-based polycarboxylic acid water reducing agent is improved, and a certain viscosity reducing effect is achieved.

The invention relates to an isopentenol polyoxyethylene ether defoaming agent and a preparation method thereof, the defoaming agent is mainly prepared from a cross-linked acrylic copolymer emulsion, an alkali swelling thickener, a modified organic silicon defoaming active matter, a pH regulator (NaOH / KOH), an isothiazolinone bactericide, deionized water and the like in proportion, and the defoaming agent has excellent defoaming performance and stability. A specific auxiliary agent is added. The foam problem of an isopentenol polyoxyethylene ether product in downstream application is solved, and the defoaming agent is mainly applied to defoaming of isopentenol polyoxyethylene ether.

The present application relates to the field of fluidized solidified soil, and discloses a kind of high-flow self-compacting fluidized solidified soil and its preparation process, including dry base engineering slag soil, mixing water, sodium hexametaphosphate, L (+) -tartaric acid, composite cementitious material, warm rubber dry powder and isoamyl alcohol polyoxyethylene ether polycarboxylic acid water reducing agent are made.The composite cementitious material is premixed with warm rubber dry powder;Slag soil is mixed with water and sodium hexametaphosphate to disperse internal mud group;Under continuous stirring, add tartaric acid aqueous solution, control the drop amount by using real-time monitoring of liquid phase pH value and closed-loop mechanism of tartaric acid consumption ratio, neutralize alkaline and inhibit early hydration heat release of cementitious material;Finally, add powder and water reducing agent for secondary stirring, and discharge and pour when liquid phase pH value jumps.The present application overcomes the hydration out of control caused by the fluctuation of different slag components through chemical synergy and dynamic feeding feedback of multiple components, avoids settlement stratification and bleeding, and ensures the stable development of high-flow state and later mechanical strength of slurry.

The application belongs to the field of microbial metabolic engineering, and discloses a Saccharomyces cerevisiae engineering strain with enhanced isopentenol tolerance and conversion capacity, and a construction method and application thereof. The Saccharomyces cerevisiae engineering strain is obtained by modifying an isopentenol utilization pathway-dependent Saccharomyces cerevisiae strain, and the energy metabolism of the Saccharomyces cerevisiae strain is enhanced to synthesize a large amount of ATP for the isopentenol utilization pathway; and the antioxidant stress resistance of the Saccharomyces cerevisiae strain is enhanced to relieve the oxidative damage caused by the isopentenol substrate. The Saccharomyces cerevisiae engineering strain is the strain with the highest efficiency in converting isopentenol into terpenes.

The invention discloses a saccharomyces cerevisiae genetically engineered bacterium for efficiently synthesizing mogroside V based on multi-compartment multi-metabolic pathways and a construction method of the saccharomyces cerevisiae genetically engineered bacterium. The preparation method comprises the following steps: anchoring an MVA pathway and a squalene synthesis pathway on the surface of a peroxisome membrane, and enabling mogrol synthetase and epoxy squalene cyclization enzyme ERG1 to form a linear polywheat complex through polypeptide interaction; then, through overexpression of MVA pathway key enzyme and introduction of an isopentenol utilization pathway, supply of precursor isopentenyl pyrophosphate and dimethyl allyl pyrophosphate in cytoplasm is increased, and squalene epoxidase ERG1 and mogrol synthetase are anchored in transmembrane ABC efflux protein PDR11 through polypeptide interaction; then anchoring the mogrol synthetase in the lipid droplet subcells; finally, the glucosyltransferase is displayed on the surface of the yeast cell wall through an alpha-lectin system, so that extracellular mogrol is converted into MG-V. The engineering bacterium improves the yield of mogroside V synthesized from the beginning in microorganisms, and has great industrial application value.

The present invention relates to a method for the preparation of 3-methyl-3-butene-1-ol (isoprenol), comprising the steps of preparing isobutylene (also: isobutene, 2-methylpropene) by contacting 3-methylbutan-1-ol (isoamyl alcohol) to a catalyst comprising at least one catalytically active metal and reacting at least one formaldehyde source and the isobutylene obtained in step a-i) to obtain isoprenol. Furthermore, the present invention refers to processes for the preparation of 3-methyl-2-butene-1-ol (prenol), of 3-methyl-3-butenal (isoprenal), of 3-methyl-2-butenal (prenal), and of 3,7-dimethy l-octa-2, 6-dienal (citral) and further downstream products comprising the use of isoprenol of the present invention and the resulting products and product streams.

The application relates to the field of building materials and discloses a sound and heat insulation light building material and a preparation method thereof. The light building material comprises cement, fly ash, river sand, quartz sand, a foaming agent, a modified composite filler-based water reducing agent and water. The foaming agent is made of sodium dodecyl sulfate, hydroxypropyl methyl cellulose, modified nano-aluminum oxide and nano-silicon dioxide. The modified nano-aluminum oxide is prepared by the following steps: reacting oleic acid with nano-aluminum oxide, emulsifying through a Pickering emulsion method, and selectively dissociating through a saponification reaction induced by sodium hydroxide. The modified composite filler-based water reducing agent is prepared by the following steps: in-situ esterification modification of a composite filler made by grafting isoprenyl alcohol polyoxyethylene ether on graphene oxide and carbon fiber, and then free radical copolymerization with acrylic acid. The light building material prepared by the application has high compressive strength and flexural strength, small water absorption and good heat insulation performance.

This invention belongs to the field of synthetic biology and microbial engineering, and discloses a chemical-biological method for preparing the isopentenyl bibenzyl compound 2-isopentenyl-3,3',4',5-tetrahydroxybibenzyl (NPB-1575) which has anti-ischemic stroke activity. The specific disclosed method includes: (1) chemically synthesizing the substrate dihydropiperidine; (2) constructing an engineered Escherichia coli strain based on the isopentenyl utilization pathway, co-expressing hydroxyethylthiazol kinase, isopentenyl phosphokinase, isopentenyl pyrophosphate isomerase and specific isopentenyl transferase, and efficiently synthesizing the isopentenyl donor; (3) using this strain to catalyze dihydropiperidine in whole cells, the yield in a 200L fermenter can reach 2.54g / L, which is nearly 40 times higher than the existing method; (4) obtaining NPB-1575 with a purity >98.5% by macroporous adsorption resin and normal / reversed phase chromatography and recrystallization. This method uses readily available raw materials, involves simple steps, is environmentally friendly, and yields high purity, laying the foundation for the development of NPB-1575 as a new drug for ischemic stroke and showing significant application potential.

The application discloses a synthesis method of lily pyran. The synthesis method uses 3-methyl-3-buten-1-ol (isopentenol) and isovaleraldehyde as raw materials, and performs a reaction in the presence of a catalyst to generate lily pyran. The catalyst is a supported catalyst, and comprises a carrier and a coating layer supported on the carrier. The coating layer comprises a Nafion polymer and an inorganic oxide, and the carrier is in a foamed state. Preferably, the carrier is selected from a combination of one or more of silicon carbide foam, aluminum foam, nickel foam and iron foam. A solution of the Nafion polymer, water and a precursor of the inorganic oxide are mixed to form a sol under stirring, and then the sol is coated on the carrier and dried to obtain the catalyst. The catalyst is used for the synthesis of lily pyran, and has the advantages of high raw material conversion rate, high product selectivity, less three-waste emissions and excellent catalyst stability.

The application discloses a process for preparing 3-methyl-2-buten-1-al diisopentyl acetal by continuous reaction rectification. The process comprises the following steps: reacting and rectifying isopentenyl alcohol and isopentenyl aldehyde in a reaction rectification tower to prepare 3-methyl-2-buten-1-al diisopentyl acetal, characterized in that the content of 2-methyl-3-buten-2-al in the liquid phase of the third to fifth trays of the reaction rectification tower from bottom to top is less than or equal to 1 wt%. By the continuous reaction rectification process, the device can be stably operated for more than 7200 hours, and the economic benefit of the enterprise can be remarkably improved.

The invention belongs to the technical field of pipe pieces, and particularly relates to a composite prefabricated concrete pipe piece and a preparation method thereof. The composite prefabricated concrete duct piece comprises a duct piece body and a reinforcement cage arranged in the duct piece body, the duct piece body is made of a concrete material, and the concrete material comprises cement, a mineral admixture, coarse aggregate, fine aggregate, an early-strength polycarboxylate superplasticizer, a functional admixture and water. The early strength type polycarboxylate superplasticizer is prepared by taking the isopentenol polyoxyethylene ether, the triallyl phosphate, the L-vinylglycine and the acrylic acid as monomers, so that the early strength of concrete is improved; modified polypropylene fiber, lithium silicate and methyl cellulose are adopted to jointly form a functional admixture, hydroxyethyl methylacrylate is grafted to the surface of the polypropylene fiber, and the anti-cracking performance, the anti-seepage performance and the mechanical performance of the concrete are improved.

The invention belongs to the technical field of enzyme engineering, and discloses a high-activity isopentenyl phosphokinase mutant and application thereof. The high-activity isopentenyl phosphokinase mutant is AtIPKH274P, and the amino acid at the 274 site of wild type AtIPK is mutated from histidine H to proline P. The invention further discloses a preparation method of the high-activity isopentenyl phosphokinase mutant. According to the present invention, the AtIPKH274P, the SmDAGKS47A and the L124A can form the efficient isopentenol utilization pathway so as to effectively convert the prenol into the DMAPP; an engineering strain with improved isopentenyl modification capability can be constructed by utilizing the approach, and the strain has more advantages compared with a traditional engineering strain based on a mevalonic acid approach.

The application provides a method for synthesizing 3-methyl-2-buten-1-ol, and belongs to the technical field of isopentenol synthesis. The method comprises the following steps: introducing 3-methyl-3-buten-1-ol and an atmosphere containing hydrogen into a fixed bed reactor, and performing a hydrogenation isomerization reaction under the action of a Pd / Al2O3 catalyst to generate 3-methyl-2-buten-1-ol; wherein the content of formaldehyde in the 3-methyl-3-buten-1-ol is 0.03-0.15%. The application adopts a fixed bed reactor to perform continuous production, adopts a Pd / Al2O3 catalyst with low palladium content as the catalyst, the preparation method is simple, the price is relatively low, and the content of formaldehyde in the 3-methyl-3-buten-1-ol is controlled to inhibit a side reaction, so that the reaction conversion rate and the product selectivity are high.

The invention belongs to the field of microbial metabolic engineering, and discloses a saccharomyces cerevisiae engineering strain with enhanced isopentenol tolerance and transformation capacity as well as a construction method and application thereof. According to the invention, an isopentenol utilization pathway dependent type saccharomyces cerevisiae strain is modified, and energy metabolism of the isopentenol utilization pathway dependent type saccharomyces cerevisiae strain is enhanced, so that a large amount of ATP is synthesized for an isopentenol utilization pathway; the anti-oxidative stress capability is enhanced, so that oxidative damage caused by an isopentenol substrate is relieved. The saccharomyces cerevisiae engineering bacterium is a bacterial strain with the highest efficiency of converting the isopentenol into the terpenoids at present.

The invention discloses a multi-gene tandem recombinant strain as well as a construction method and application thereof. The invention also discloses a method for synthesizing lycopene based on an isopentenol utilization approach. The strain comprises a recombinant strain of seven key genes, namely mtipk, thim, ispA, idi, crtE, crttheB and crtI, for synthesizing lycopene in an IUP (Inhibitory Urinary Protein) way. According to the invention, the isopentenol is introduced into the escherichia coli in a way to synthesize the lycopene; according to the approach, only two-step phosphorylation reaction is used for replacing the original 2-C-methyl-D-erythritol-4-phosphoric acid approach and mevalonic acid approach which need more than seven steps to synthesize precusor substances pentadienyl pyrophosphoric acid and dimethyl allyl pyrophosphate ester of lycopene, so that the metabolic pathway is greatly shortened, and competition with central carbon metabolism in cells is avoided; the toxicity caused by accumulation of intermediate products in the metabolic process is reduced, and lycopene can be efficiently synthesized by using a cheap substrate.

The application provides an acid anhydride low-sensitivity polycarboxylic acid water reducing agent and a preparation method and application thereof, an intermediate is prepared by alcoholysis of maleic anhydride and ring-opening polymerization of maleic acid monoester and ethylene oxide, the carboxyl in the maleic acid ester is esterified by ethylene oxide, a part of carboxylic acid is protected, crosslinking of the main chain is prevented, and then the polymer quality is improved to prevent the generation of later-stage precipitation; and the esterification protects the carboxyl, further improves the slump flow retention performance, makes the slump flow retention agent content lower in the application process of the water reducing agent, and the effect is more obvious. Compared with the prior art, the isopentenyl alcohol polyoxyethylene ether is copolymerized with maleic anhydride and a functional monomer of the maleic anhydride to synthesize a high-conversion-rate low-sensitivity viscosity-reducing mother liquor, the solid content of the base liquid and the catalyst dosage are adjusted, so that the application can occur the polymerization reaction at normal temperature, and the energy consumption is low at normal temperature. The intermediate after functionalization of the maleic anhydride is used to participate in the free radical polymerization reaction, and the monomer conversion rate of the reaction product is generally higher than 80%.

The application discloses a process for preparing nano-silica modified polycarboxylic acid water reducing agent by using a tip ultrasonic device, which comprises the following steps: S1, preparing a maleic acid solution and a hydrogen peroxide solution by respectively dissolving maleic acid and hydrogen peroxide in distilled water, and preparing a mixed solution of mercaptopropionic acid and ascorbic acid by dissolving mercaptopropionic acid and ascorbic acid in distilled water; S2, mixing and dissolving equal-molar-ratio methyl alkenyl alcohol polyoxyethylene ether and iso-pentenyl alcohol polyoxyethylene ether in distilled water to prepare a mixed solution, then adding the hydrogen peroxide solution, and sequentially adding the maleic acid solution, the mixed solution of mercaptopropionic acid and ascorbic acid and a nano-SiO2 suspension solution drop by drop, respectively completing the dropwise addition within 1.5-2 h, 2-3 h and 1.5-2 h, and performing tip ultrasonic treatment; and S3, after heat preservation for 1-2 h, cooling to room temperature. The application improves the stability and long-acting property of dispersion in cement-based materials such as concrete, and realizes long-time enhancement effect on macroscopic properties of the cement-based materials, including mechanical properties and working properties.

A process for the preparation of isoprenol comprises the steps of a-i) preparing isobutylene by oxidizing isoamyl alcohol to isovaleric acid, and subjecting the isovaleric acid to oxidative decarboxylation so as to obtain isobutylene; and a-ii) reacting at least one formaldehyde source and the isobutylene obtained in step a-i) to obtain isoprenol. The process allows for providing isobutylene for the preparation of isoprenol and its downstream products, including prenol, prenal, isoprenal and / or 3,7-dimethyl-octa-2,6-dienal (citral), from renewable sources.

The invention relates to the technical field of building materials, and particularly discloses a special admixture for self-compacting concrete as well as a preparation method and application thereof. Wherein preparation raw materials of the admixture special for the self-compacting concrete comprise a polycarboxylic acid water reducing agent, a slump retaining type water reducing agent, modified starch, a defoaming agent, an air entraining agent and water, and preparation raw materials of the polycarboxylic acid water reducing agent comprise, by weight, methyl allyl polyoxyethylene ether, hydroxyl polyethylene glycol acrylate, tween-80, sulfosalicylic acid, mercaptoacetic acid and ammonium persulfate; the slump-retaining water reducing agent is prepared from the following raw materials in parts by weight: isopentenol polyoxyethylene ether, acrylic acid, ester monomers, mercaptopropionic acid and potassium persulfate. According to the admixture special for the self-compacting concrete, a long side chain, a sulfonic acid group and an ester group are introduced in the forming process of the water reducing agent, the flow stability of the concrete in the construction process is improved, and good construction performance is kept.

The present disclosure relates to an improved method for regiospecific and stereospecific synthesis of polyisopentenyl compounds. More particularly, it discloses regiospecific and stereospecific synthesis of (2E, 6E, 10E, 14E, 18E, 22E)-3, 7, 11, 15, 19, 23, 27-heptamethyl octacosa-2, 6, 10, 14, 18, 22, 26 heptaen-1-ol useful for the synthesis of vitamin K2-7.

The invention discloses a viscosity reduction type polycarboxylic acid water reducing agent, a preparation method thereof and application of the viscosity reduction type polycarboxylic acid water reducing agent in concrete such as aluminoferrite and the like. The viscosity reduction type polycarboxylic acid water reducing agent can be particularly applied to aluminoferrite cement concrete systems, high-performance sprayed concrete systems, ultra-high-performance concrete systems, high-grade common concrete systems and the like. The water reducing agent is prepared through a high-molecular polymerization reaction and mainly comprises at least one of isopentenol polyoxyethylene ether, isobutenol polyoxyethylene ether, ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl ether. The invention relates to a water-based acrylic acid / methacrylic acid copolymer, which comprises deionized water, maleic anhydride, maleic anhydride glyceride, sodium methallyl sulfonate, ethanol, sodium p-styrenesulfonate, a chain transfer agent, an initiator, acrylic acid, methacrylic acid, ethyl acrylate, a micromolecular functional monomer and the like, wherein the micromolecular functional monomer is triphenyl acetic acid-2-butene ester or 2-butene-1-O-TIPS. The viscosity reduction type polycarboxylate superplasticizer provided by the invention can obviously reduce the viscosity of concrete / mortar over time and improve the construction performance.

This invention discloses a method for preparing optically active citronellol, comprising the following steps: preparing optically active R-citronellol by asymmetric hydrogenation of neraldehyde and / or geranialdehyde in the presence of a catalyst, wherein the catalyst comprises a transition metal rhodium and a bisphosphine ligand, wherein the mass of isopentenol in the raw material neraldehyde or geranialdehyde is 100-500 ppm of the mass of neraldehyde or geranialdehyde, and the mass of 3,7-dimethyl-2,6-octadienoic acid is 500-1000 ppm of the mass of neraldehyde or geranialdehyde; the preparation method of this invention can significantly improve the catalytic stability of optically active transition metal catalysts used for homogeneous catalysis and asymmetric hydrogenation, yielding R-citronellol with high optical purity, while simplifying the process flow, avoiding the introduction of new impurities, and exhibiting significant economic benefits.

The invention discloses a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof. The viscosity reduction type polycarboxylate superplasticizer is prepared from 40-60 parts of unsaturated polyether macromonomer, 8-15 parts of unsaturated carboxylic acid micromonomer, 0.5-2 parts of chain transfer agent, 0.3-1.5 parts of initiator, 20-35 parts of deionized water and 5-12 parts of functional viscosity reduction monomer. The functional viscosity-reducing monomer is an unsaturated monomer containing a sulfonate group or a polyether side chain and comprises at least one of 5-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 7-12 parts of isopentenol polyoxyethylene polyoxypropylene ether and 10-20 parts of sodium allysulfonate, and the content of the 2-acrylamide-2-methylpropanesulfonic acid is 5-8 parts, the content of the isopentenol polyoxyethylene polyoxypropylene ether is 7-12 parts. The use amount of sodium allysulfonate is 5-10 parts, and the total use amount is 5-12 parts. The concrete mixing device has the beneficial effects that the sticky phenomenon after concrete mixing is avoided, the energy consumption of mixing equipment is reduced, the construction efficiency and the engineering quality stability are improved, rapid reduction of fluidity is avoided, the time requirement for long-distance transportation or continuous pouring of mass concrete is met, and potential safety hazards caused by implosion or reagent residues are avoided.

The invention discloses a method for increasing the yield of yeast terpenoids through trace isopentenol synergistic enhanced two-phase fermentation, and belongs to the fields of industrial microbial fermentation, synthetic biology and metabolic engineering. Through the synergistic effect, the total yield of the terpenoids has a qualitative leap compared with that of a traditional single two-phase fermentation system. According to the method, the cell membrane permeability can be actively increased by utilizing the isopentenol at low concentration for the first time. According to the method, only one step of simple operation is added on the basis of an existing mature two-phase fermentation process, complex gene modification or equipment investment is not needed, and the industrial application prospect is wide. The method can effectively relieve product feedback inhibition, significantly improve the yield and simplify downstream extraction, and is mainly used for microbial fermentation production of terpenoids. The invention creatively expands the isopentenol from a pure metabolic substrate to a permeable membrane regulating agent in a specific scene, and opens up a new field for the application of the substance.

The invention relates to the field of tunnel engineering materials, and particularly discloses a tunnel double-liquid grouting material stabilizer and a preparation method and application thereof. The tunnel double-liquid grouting material stabilizer comprises the following raw materials: a water reducing agent and cellulose in a weight ratio of (2.1-2.6): (3-4), and the water reducing agent is prepared by the following steps: mixing isopentenol polyoxyethylene ether, acrylic acid and vinyltriethoxysilane in a weight ratio of 75: (5.4-8.1): (3.1-12.4), and reacting at 40-45 DEG C to obtain the water reducing agent; the preparation method comprises the step of blending the water reducing agent and the cellulose to obtain the stabilizing agent for the tunnel double-liquid grouting material. The product provided by the invention, cement, bentonite, water glass and water form the tunnel double-liquid grouting material with good stability, flow rate and stone rate.

The invention relates to a process for the preparation of 3-methyl-2-butenal (isopentenal), for the preparation of 3-methyl-2-buten-1-ol (isopentenol), for the preparation of diisopentenyl acetic acid esters for the preparation of isopentenal, and for the preparation of 3, 7-dimethyl-oct-2, 6-dienal (citral), in particular to a process for the preparation of 3, 7-dimethyl-oct-2, 6-dienal. Wherein the aldehyde content in the one or more reactant streams is maintained below a threshold. Furthermore, the present invention relates to product streams of isopentenal, isopentenol, diisopentenyl acetate of isopentenal, and citral, which can be obtained.

The invention provides a pH / salt / temperature multi-response type polyether water-based drilling fluid filtrate reducer as well as a preparation method and application thereof. The filtrate reducer is prepared from the following raw materials in parts by mass: 3 to 10 parts of acrylic acid, 1 to 10 parts of acrylamide, 2 to 15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 to 20 parts of sodium p-styrenesulfonate, 5 to 20 parts of dimethylaminoethyl methacrylate, 1 to 15 parts of isopentenol polyoxyethylene ether, 0.1 to 1 part of an initiator A, 0.1 to 0.8 part of an initiator B and 100 to 140 parts of water. The synergistic effect of multiple groups in the filtrate reducer can optimize the mud cake structure and reduce the filter loss, synchronous stability of the rheological property and filter loss control of drilling fluid under the triple environmental factors of pH / salt / temperature can be achieved, and the complex drilling requirements of deep layers and CO2-containing gas reservoirs are met.

The present invention provides a method for continuously preparing 3 methyl 2 butylene 1 aldehyde diisopentenyl acetals, the method comprising the steps of: mixing raw material isopentanol and isopentenyl aldehyde according to a certain ratio to obtain a mixture, then the mixture is continuously fed from the middle part of the reaction section of a reactive distillation tower after being preheated by a heat exchanger into a tower for condensation reaction, wherein the reaction section is loaded with a modified SAPO 34 molecular sieve catalyst; and the water generated by the reaction and unreacted raw material are separated in a tower top oil-water separator, the oil phase is transported to a designated storage tank, and the aqueous phase is discharged as waste water, and the reactor obtains a higher content of 3 methyl 2 butylene 1 aldehyde diisopentenyl acetals. The present invention uses modified SAPO 34 molecular sieve catalysts to reduce reaction temperature, improve selectivity, reduce production energy consumption, extend catalyst life, and is conducive to industrialized production under the premise of ensuring high activity.

The invention relates to the technical field of concrete, and discloses a triethanolamine-containing concrete tackifier and a preparation method thereof, the triethanolamine-containing concrete tackifier comprises the following components by weight: 20-25 parts of a tackifying polymer, 0.4-0.6 part of triethanolamine, 2-4 parts of modified cellulose, 0.1-0.3 part of calcium formate, and 0.2-0.3 part of sodium gluconate. Wherein the tackifying polymer is prepared by copolymerizing isopentenol polyoxyethylene ether, N, N-dimethylacrylamide and acrylic acid; the modified cellulose is obtained through oxidation, tertiary amino modification and quaternization, and the dispersity and compatibility of the cellulose are remarkably improved. The tackifier effectively solves the problems of segregation and bleeding caused by insufficient viscosity of traditional concrete, has a synergistic effect with a polycarboxylate superplasticizer, improves workability and pumpability, and is suitable for high-rise buildings and large-span projects.