天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

Catalyst and Auxiliary

The catalyst can change the reaction rate in the chemical reaction, and the composition and the quality of the catalyst can be kept constant after the reaction. The catalyst that accelerates the reaction is called the positive catalyst, slows down called Negative Catalyst or slow agent. It said catalyst is a positive catalyst for the general correction. This kind of catalyst in the industry, especially the organic chemical industry used more, and has great significance, Such as sulfuric acid prepared by contacting, ammonia, hydrolysis of the ester and polysaccharide, Oil Hydrogenation, etc. Commonly used catalysts are mainly metal, metal oxide and inorganic acid. If the catalyst is solid, the substance of the reaction is gas, to form a multi-phase catalytic reaction, this catalyst, sometimes called catalyst or contact agent. The catalyst is generally selective, it can only make a reaction or a certain type of reaction to speed up. But some reaction can be used for a variety of catalysts, such as the hydrogenation reaction can often be platinum, palladium, nickel, should be carefully chosen. In the catalytic reaction, the catalyst is often added cocatalyst known to enhance catalytic action of the catalyst. For example, iron is a catalyst in ammonia industry, adding a small amount of potassium and aluminum can enhance the catalytic effect of iron. The composition and weight of the catalyst and cocatalyst cannot change before and after the reaction. All of the above are inorganic catalysts. The enzyme is a protein, is very important organic catalyst.

There are many kinds of catalyst, catalyst and reaction system according to the phase of the classification, there are two types of homogeneous and heterogeneous catalysts. Heterogeneous catalysts most widely used, there are 3 kinds of gas, liquid and solid state, the variety and application of solid catalyst. The solid catalyst, which is made of metal (nickel, platinum, palladium, chromium, cobalt, titanium, vanadium, etc.) or metal oxide (copper oxide, vanadium pentoxide, lead oxide), is dispersed and deposited on the carrier in order to obtain a good dispersion effect and increase the specific surface area. The catalyst requires reliable activity, stability, selectivity, long working life, not easy to poisoning and over-burning, easy to regenerate. In order to improve the catalytic efficiency, the pure metal catalysts are made into alloy catalysts (such as nickel aluminium alloy) and composite catalysts (ZieglerNatta). The composite catalyst is composed of main catalyst and co-catalyst. In the new efficient catalysts also add other components. The production and development of high efficiency catalyst have promoted the development of polymer materials, and produced much polymer function and structure material ,which is new generation of high performance and high added value.

With the extensive application of catalyst and a number of new catalysts, we can make a lot of new chemical reactions to achieve industrialization, in order to provide an increasing number of chemical products; also can make some of the original chemical reaction conditions have been improved, in order to improve the production efficiency and product quality, make full use of resources. The important subject in the field of modern chemistry and chemical research is to select and develop more and better catalyst for the new generation. But the role of a catalyst is not beneficial to humans, such as combustion products of supersonic jet fuel as a catalyst can cause the stratosphere (10 to 50 km altitude) decomposition of ozone in the atmosphere, to the sun's ultraviolet absorption decreased, resulting in some areas of skin cancer patients increased. Is developing a new supersonic jet fuel, its combustion products will not become a catalyst,which will cause the ozone decomposition catalyst in the stratosphere.

Additives are added in the industrial and agricultural production, especially in the chemical production of some of the auxiliary chemicals, its role is to improve the production process, improve product quality and yield, or to give the product a unique application performance.

Additive are large class of important chemical in the production of auxiliary raw materials, they can give a special performance to product, improve use of finished products; and can accelerate the chemical reaction rate, improve product yield; they can save raw materials, improve processing efficiency. Additives are widely used in the chemical industry, especially organic synthesis, synthetic material processing and petroleum refining, pesticide, medicine, dye, paint and other industrial sectors. Additives can be divided into synthesized additives and processing additives. Synthetic additives are used in monomer synthesis and polymerization of a variety of auxiliary agents in resin, fiber, rubber, etc. They include catalysts, initiators, solvents, dispersants, emulsifiers, polymerization inhibitors, regulators, termination agents, etc. Processing aid refers to the auxiliary chemicals used in the manufacture of raw rubber, plastics processing, chemical fiber spinning and spinning process, including plasticizers, heat stabilizers, antioxidants, light stabilizers , flame retardants, blowing agents, lubricants, mold release agents, curing agents, accelerators, softeners, anti-scorching agents, surfactants, oils, fillers, etc. In these additives, many of them are dangerous chemicals, Such as benzoyl peroxide, azobisisobutyronitrile, hydrogen peroxide - ferrous blue, alkyl aluminum chloride, titanium and other initiators, catalysts are inflammable and explosive materials, should be required to "chemical Dangerous Goods Safety Management Regulations", for storage, transportation, operation and use.

Click on the specific product, view the latest prices of the products, information, serving information
Structure Chemical Name CAS MF
DSPE-PEG-CLS DSPE-PEG-CLS
Polyurethane Polyurethane 9009-54-5 C3H8N2O
1,1'-(isopropylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene] 1,1'-(isopropylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene] 97416-84-7 C23H24Br8O2
Alkylsulfonic phenyl ester Alkylsulfonic phenyl ester 91082-17-6
Palladate(1-), [2′-(amino-κN)[1,1′-biphenyl]-2-yl-κC]chloro[2′-(dicyclohexylphosphino-κP)-2,6-dimethoxy[1,1′-biphenyl]-3-sulfonato]-, sodium (1:1) Palladate(1-), [2′-(amino-κN)[1,1′-biphenyl]-2-yl-κC]chloro[2′-(dicyclohexylphosphino-κP)-2,6-dimethoxy[1,1′-biphenyl]-3-sulfonato]-, sodium (1:1) 2375242-78-5 C38H44ClNO5PPdS.Na
DSPE-PEG1000-NH2 DSPE-PEG1000-NH2
Powder Metallurgy Ruthenium Powder Powder Metallurgy Ruthenium Powder
Gold nanocubes/Silver nanocubes/Gold nanocages/Pd nanoparticles Gold nanocubes/Silver nanocubes/Gold nanocages/Pd nanoparticles
Palladium, [2'-(amino-κN)[1,1'-biphenyl]-2-yl-κC](methanesulfonato-κO)(triphenylphosphine)- Palladium, [2'-(amino-κN)[1,1'-biphenyl]-2-yl-κC](methanesulfonato-κO)(triphenylphosphine)- 1445086-02-1 C31H28NO3PPdS
Chloro[(1,2,5,6-η)-1,5-cyclooctadiene](2,2-dimethylpropyl)-palladium 95% Chloro[(1,2,5,6-η)-1,5-cyclooctadiene](2,2-dimethylpropyl)-palladium 95% 935838-06-5 C13H23ClPd
Di-μ-chlorodimethylbis(triphenylphosphine)dipalladium 96% Di-μ-chlorodimethylbis(triphenylphosphine)dipalladium 96% 149869-56-7 C38H36Cl2P2Pd2
SPA-PEG-SPA SPA-PEG-SPA
BIS(ETHYLENEDIAMINE)PALLADIUM(II) DICHLORIDE BIS(ETHYLENEDIAMINE)PALLADIUM(II) DICHLORIDE 16483-18-4 C4H12ClN4Pd+
polyacrylonitrile fibre、Acrylic fiber polyacrylonitrile fibre、Acrylic fiber
UV-84 UV-84
Alkyl Ketene Dimer Alkyl Ketene Dimer 144245-85-2
Uvinul 5050 H Uvinul 5050 H 152261-33-1
cis-Dimethyl(N,N,N',N'-tetramethylethylenediamine)palladium(II), 99% cis-Dimethyl(N,N,N',N'-tetramethylethylenediamine)palladium(II), 99% 113822-11-0 C8H22N2Pd
mPEG8-11-Mercaptoundecanamide mPEG8-11-Mercaptoundecanamide
D.E.R.(R) 332 D.E.R.(R) 332 25085-99-8 C21H24O4
46 base oil 46 base oil
NHS-PEG-Silane Silane-PEG-NHS NHS-PEG-Silane Silane-PEG-NHS
No. 68 cosmetic white oil No. 68 cosmetic white oil
Recovery of palladium materials from brine Recovery of palladium materials from brine
COOH-PEG-SH COOH-PEG-SH
Thalidomide-O-PEG4-azide Thalidomide-O-PEG4-azide 2380318-57-8 C23H29N5O9
ROYCO 43 ADVANCED SYNTHETIC MULTI-PURPOSE AIRCRAFT GREASE ROYCO 43 ADVANCED SYNTHETIC MULTI-PURPOSE AIRCRAFT GREASE
IA-PEG3-N3 IA-PEG3-N3
N3-PEG7-SPA N3-PEG7-SPA
N3-PEG-Tretinoin N3-PEG-Tretinoin
POLYETHYLENEGLYCOL BISPHENOL A EPICHLOROHYDRIN COPOLYMER 15,000-20,000 DA POLYETHYLENEGLYCOL BISPHENOL A EPICHLOROHYDRIN COPOLYMER 15,000-20,000 DA 42617-82-3 [C15H16O2C3H5ClO(C2H4O)nH2O]x
Platinum and palladium carbon catalyst Platinum and palladium carbon catalyst
UV Absorber 400 UV Absorber 400 153519-44-9 C81H108N6O8
α-Carboxyl-ω-glycidyl poly(ethylene glycol) α-Carboxyl-ω-glycidyl poly(ethylene glycol)
2-[2-[2-(2-Mercaptoethoxy)ethoxy]ethoxy]acetic Acid 2-[2-[2-(2-Mercaptoethoxy)ethoxy]ethoxy]acetic Acid 200291-35-6 C8H16O5S
Alkyne-PEG-SH Alkyne-PEG-SH
mPEG-CHO mPEG-CHO
NH2-PEG-EP NH2-PEG-EP
Industrial white oil No. 7 Industrial white oil No. 7
Benzene,1,4-bis(1-methylethyl)-,homopolymer 
Benzene,1,4-bis(1-methylethyl)-,homopolymer 25822-43-9 C12H18
Tris(dibenzylideneacetone)dipalladium Tris(dibenzylideneacetone)dipalladium 60748-47-2 C51H42O3Pd2
8-Arm PEG-EP 8-Arm PEG-EP
Esacure KIP 160 Esacure KIP 160 71868-15-0 C20H22O5
(Dimethylsilylene)bis(2-methyl-4-phenylindenyl)zirconium dichloride (Dimethylsilylene)bis(2-methyl-4-phenylindenyl)zirconium dichloride 158515-16-3 C34H32Cl2SiZr-2
DPPE PEG NHS DPPE PEG NHS
DBCO PEG Biotin DBCO PEG Biotin
DTPA PEG Biotin DTPA PEG Biotin
Progestrone PEG amine Progestrone PEG amine
Methotrexate PEG Fluorescein Methotrexate PEG Fluorescein
Ru(bpm)3(PF6)2 Ru(bpm)3(PF6)2 85335-55-3 C24H18F6N12PRu+
Biotin-PEG4-S-S-NHS Biotin-PEG4-S-S-NHS 1260247-51-5 C30H49N5O11S3
P(t-Bu)3 Pd G4 P(t-Bu)3 Pd G4 1621274-11-0 C26H45NO3P3PdS-3
Guanidine sulfamate Guanidine sulfamate 51528-20-2 CH8N4O3S
2-Diazo-1-naphthol-5-sulfonyl chloride 2-Diazo-1-naphthol-5-sulfonyl chloride 3770-97-6 C10H7ClN2O3S
Rubber Rubber
Ms-PEG10-Ms Ms-PEG10-Ms 109789-42-6 C20H42O14S2
Ethylene-chlorotrifluoroethylene resin Ethylene-chlorotrifluoroethylene resin
Vulcanization accelerator Vulcanization accelerator
Rhodium catalyst Rhodium catalyst
Neutral silicone sealant Neutral silicone sealant
Ruthenium aluminium oxide catalyst Ruthenium aluminium oxide catalyst
Cyclohexanol, 4,4-(1-methylethylidene)bis-, polymer with (chloromethyl)oxirane Cyclohexanol, 4,4-(1-methylethylidene)bis-, polymer with (chloromethyl)oxirane 30583-72-3 C18H33ClO3
PD 130327 PD 130327 151638-53-8
JL-1500A8 JL-1500A8
V8 Curing Agent V8 Curing Agent
NA NA
alpha-t-Butyloxycarbonylamino-omega-mercapto poly(ethylene glycol) (PEG-MW 10.000 Dalton) alpha-t-Butyloxycarbonylamino-omega-mercapto poly(ethylene glycol) (PEG-MW 10.000 Dalton) C11H23NO4S
Ethylene oxychlorination catalyst Ethylene oxychlorination catalyst
DOWEX(R) 50 WX8 DOWEX(R) 50 WX8 11119-67-8 N/A
Flocculant Flocculant
RuPhos Pd G3 RuPhos Pd G3 1445085-77-7 C43H57NO5PPdS-
Antioxidant 1790 Antioxidant 1790 40601-76-1 C42H57N3O6
HOOCCH2CH2O-PEG10-CH2CH2COOH HOOCCH2CH2O-PEG10-CH2CH2COOH 2097010-30-3 C26H50O15
Glycerol triglycidyl ether Glycerol triglycidyl ether 13236-02-7 C12H20O6
HZ-PEG-OH HZ-PEG-OH
8-arm-PEG-DSPE 8-arm-PEG-DSPE
mPEG-Rhodamine mPEG-Rhodamine
E3 Ligase Ligand-Linker Conjugates 24 (TFA) E3 Ligase Ligand-Linker Conjugates 24 (TFA) 1957235-75-4 C23H27F3N4O10
4-ARMPEG-CLS 4-ARMPEG-CLS
Alkyne-PEG-Biotin Alkyne-PEG-Biotin
Biotin-PEG-SVA Biotin-PEG-SVA
CLS-PEG-CLS CLS-PEG-CLS
FITC-PEG-Alkyne FITC-PEG-Alkyne
Fmoc-NH-PEG-OH Fmoc-NH-PEG-OH
mPEG-DLPE mPEG-DLPE
mPEG-PFP mPEG-PFP
Palmitic acid-PEG-SC Palmitic acid-PEG-SC
Phthalimide-PEG-OH Phthalimide-PEG-OH
PLGA(5K)-PEG-Mal PLGA(5K)-PEG-Mal
PLGA(8K)-PEG-NH2 PLGA(8K)-PEG-NH2
Methoxy polyethylene glycol polycaprolactone Methoxy polyethylene glycol polycaprolactone
Diethoxylsilane-PEG-SC Diethoxylsilane-PEG-SC
Boc-NH-PEG-CHO Boc-NH-PEG-CHO
PLGA(10K)-PEG-SH PLGA(10K)-PEG-SH
4-ArmPEG-(3Mal-1Biotin) 4-ArmPEG-(3Mal-1Biotin)
mPEG-C18H37 mPEG-C18H37
mPEG-DEPE mPEG-DEPE
NH2-PEG-TPP NH2-PEG-TPP
Ultranox 626 Ultranox 626 26741-53-7 C33H50O6P2
HomePage | Member Companies | Advertising | Contact us | Previous WebSite | MSDS | CAS Index | CAS DataBase
Copyright © 2016 ChemicalBook All rights reserved.