成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

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
PLA(2K)-PEG-NH2 PLA(2K)-PEG-NH2
cRGD-PEG-NH2 cRGD-PEG-NH2
Ultrafine Ruthenium Powder Ultrafine Ruthenium Powder
N-LAURYLDIETHANOLAMINE N-LAURYLDIETHANOLAMINE 1541-67-9 C16H35NO2
Parylene F Dimer Parylene F Dimer 1785-64-4 C16H8F8
Teflon emulsion JF-4DCD Teflon emulsion JF-4DCD
PALLADIUM (II) CYANIDE PALLADIUM (II) CYANIDE 2035-66-7 C2N2Pd
Palladium carbon hydrogenation catalyst Palladium carbon hydrogenation catalyst
Paliocolor LC 756 Paliocolor LC 756 223572-88-1 C50H46O20
Irganox 3052 Irganox 3052 61167-58-6 C26H34O3
Octabromobisphenol-S Octabromobisphenol-S 42757-55-1 C18H14Br8O4S
Cu-SSZ-39  Catalyst Cu-SSZ-39 Catalyst
BISPHENOL A DIGLYCIDYL ETHER RESIN BISPHENOL A DIGLYCIDYL ETHER RESIN 25068-38-6 C15H16O2
diamminebis(cyano-C)palladium diamminebis(cyano-C)palladium 15020-94-7 C2H6N4Pd
Alcohols, C9-11, ethoxylated Alcohols, C9-11, ethoxylated 68439-46-3
TEREPHTHALYLIDENE DICAMPHOR SULFONIC ACID TEREPHTHALYLIDENE DICAMPHOR SULFONIC ACID 90457-82-2 C28H34O8S2
Ruthenium target Ruthenium target
BROMOBIS(PH3P)(N-SUCCINIMIDE)PD(II) BROMOBIS(PH3P)(N-SUCCINIMIDE)PD(II) 251567-28-9 C40H37BrNO2P2Pd
BPA-PO BPA-PO
Palladium ETCH TFP Palladium ETCH TFP
MPEG11-NHS MPEG11-NHS 756525-94-7 C30H55NO16
4-arM Poly(ethylene glycol) glycidyl ether 4-arM Poly(ethylene glycol) glycidyl ether
XPhos Pd G2 XPhos Pd G2 1310584-14-5 C45H58ClNPPd+2
PEG400DA PEG400DA
cheMlok 205 cheMlok 205
POTASSIUM TETRACYANOPALLADATE(II) TRIHYDRATE POTASSIUM TETRACYANOPALLADATE(II) TRIHYDRATE 14516-46-2 C4H6K2N4O3Pd
Xantphos Pd G3 Xantphos Pd G3 1445085-97-1 C52H46NO4P2PdS-
Estrogen PEG DSPE Estrogen PEG DSPE
Linoleic acid PEG NHS Linoleic acid PEG NHS
Acryloyl PEG amine Acryloyl PEG amine
Metal deactivator T551 Metal deactivator T551
endo-BCN-PEG8-NHS ester endo-BCN-PEG8-NHS ester 1608140-48-2 C34H54N2O14
FMOC-NH-PEG10-NH2 FMOC-NH-PEG10-NH2
TETRAAMMINEPALLADIUM(II) ACETATE TETRAAMMINEPALLADIUM(II) ACETATE 61495-96-3 C2H11N4O2Pd+
Drometrizole Drometrizole 2440-22-4 C13H11N3O
ACA-PEG-NH2 ACA-PEG-NH2
GAS-PEG-GAS GAS-PEG-GAS
8-arm-PEG-LA 8-arm-PEG-LA
Boc-NH-PEG-Alkyne Boc-NH-PEG-Alkyne
N3-PEG-COOH N3-PEG-COOH
Silane-PEG-N3 Silane-PEG-N3
CH2CH2COOH-PEG-CH2CH2COOH CH2CH2COOH-PEG-CH2CH2COOH
DMPE-PEG-CY3 DMPE-PEG-CY3
DSPE-PEG-OPSS DSPE-PEG-OPSS
Estrogen-PEG-Mal Estrogen-PEG-Mal
FITC-PEG-Estrogen FITC-PEG-Estrogen
Gala-PEG-SH Gala-PEG-SH
mPEG-N+Me3 mPEG-N+Me3
OH-PEG40-OH OH-PEG40-OH
PLA(2K)-PEG-OH PLA(2K)-PEG-OH
PLGA(18K)-PEG-Mal PLGA(18K)-PEG-Mal
STA-PEG-FA STA-PEG-FA
SVA-PEG-SVA SVA-PEG-SVA
SA-PEG-OH SA-PEG-OH
Tetraamminepalladium(II) dichloride Tetraamminepalladium(II) dichloride 13815-17-3 ClH8N4Pd+
2,2-BIS(2-HYDROXY-5-BIPHENYLYL)PROPANE 2,2-BIS(2-HYDROXY-5-BIPHENYLYL)PROPANE 24038-68-4 C27H24O2
Dopamine-PEG-Dopamine Dopamine-PEG-Dopamine
8-arm-PEG-OPSS 8-arm-PEG-OPSS
FA-PEG-OH FA-PEG-OH
mPEG-FITC mPEG-FITC
OPSS-PEG-MAL OPSS-PEG-MAL
PLGA-COOH PLGA-COOH
8-ArmPEG-(7Arm-COOH,1ARrm-NH2) 8-ArmPEG-(7Arm-COOH,1ARrm-NH2)
ACA-PEG-NH-Mal ACA-PEG-NH-Mal
Benzyl-PEG40-OH Benzyl-PEG40-OH
CLS-PEG-NBD CLS-PEG-NBD
COOH-PEG-NH2.HCl COOH-PEG-NH2.HCl
DMPE-PEG-SC DMPE-PEG-SC
DPPE-PEG-SC DPPE-PEG-SC
FA-PEG4-Alkyne FA-PEG4-Alkyne
mPEG-Anilin mPEG-Anilin
N3-PEG-PAA(1.8K)-DA N3-PEG-PAA(1.8K)-DA
PLGA(12K)-PEG-NH2 PLGA(12K)-PEG-NH2
PLGA(2K)-PEG-COOH PLGA(2K)-PEG-COOH
STA-PEG-SC STA-PEG-SC
Pomalidomide-PEG4-CO2H Pomalidomide-PEG4-CO2H 2138440-81-8 C24H31N3O10
4-((2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)amino)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione 4-((2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)amino)-2-(2,6-dioxopiperidin-3-yl)isoindoline-1,3-dione 2093416-31-8 C21H28N4O7
2-(2H-Benzothiazol-2-yl)-6-(dodecyl)-4-methylphenol 2-(2H-Benzothiazol-2-yl)-6-(dodecyl)-4-methylphenol 125304-04-3 C25H35N3O
Hydrogen transfer palladium carbon catalyst Hydrogen transfer palladium carbon catalyst
Palladium hydroxide carbon catalyst Palladium hydroxide carbon catalyst
Gold bond alloy silver bond alloy palladium bond alloy copper bond alloy Gold bond alloy silver bond alloy palladium bond alloy copper bond alloy
Dsixty five Dsixty five
D20 environmentally friendly solvent oil D20 environmentally friendly solvent oil
2-Allyloxy-1,3,5-tribromobenzene 2-Allyloxy-1,3,5-tribromobenzene 3278-89-5 C9H7Br3O
DBCO-PEG8-amine DBCO-PEG8-amine
DBCO-PEG12-O-NH2 DBCO-PEG12-O-NH2
Benzyl-PEG18-Br Benzyl-PEG18-Br
Fmoc-NH-PEG4-ACA Fmoc-NH-PEG4-ACA
4-ArmPEG-NTA 4-ArmPEG-NTA
4-ArmPEG-(3Alkyne-1NHS) 4-ArmPEG-(3Alkyne-1NHS)
1,2-distearoyl-sn-glycero-3-phosphoethanolaMine-N-[biotinyl(polyethylene glycol)-2000] (aMMoniuM salt) 1,2-distearoyl-sn-glycero-3-phosphoethanolaMine-N-[biotinyl(polyethylene glycol)-2000] (aMMoniuM salt) 385437-57-0
SH-PEG-SH SH-PEG-SH
No.26white oil No.26white oil
Bis-(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate Bis-(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate 129757-67-1 C40H80N2O6
NPC-PEG-NPC(NPC:4-nitrophenyl carbonate) NPC-PEG-NPC(NPC:4-nitrophenyl carbonate)
Biotin-PEG-MAL Biotin-PEG-MAL C24H37N5O6S
4-Arm PEG-Glutaric Acid 4-Arm PEG-Glutaric Acid
DSPE-PEG-SH DSPE-PEG-SH C44H86NO10PS
SPhos Palladacycle Gen. 4 SPhos Palladacycle Gen. 4 1599466-87-1 C40H50NO5PPdS
Fluorescein-PEG6-Acid Fluorescein-PEG6-Acid 2055014-69-0 C36H42N2O13S
HomePage | Member Companies | Advertising | Contact us | Previous WebSite | MSDS | CAS Index | CAS DataBase
Copyright © 2016 ChemicalBook All rights reserved.