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Catalyst and Auxiliary

Catalyst refers to a substance that can change the rate of chemical reaction but does not consume in the reaction itself. It can also act on plants and change the growth rate of plants. According to the definition of the International Union of Pure and Applied Chemistry in 1981:Catalyst is a substance that changes the reaction rate but does not change the Gibbs free energy of the general standard of reaction. It is a very stable substance, its own composition, chemical properties and quality will not change before and after the reaction, and its relationship with the reaction system is like a lock and a key, with a high degree of selectivity, also known as specificity. It is mainly reflected in: 1. A catalyst does not catalyze all chemical reactions   2.Some chemical reactions are not the only catalyst   3.A chemical reaction has more than one catalyst.
There are many kinds of catalysts, which can be divided into liquid catalyst and solid catalyst according to the state, main catalyst and co-catalyst according to the size of the action, polymerization, Polycondensation, oxidation, reduction and other catalysts according to the type of reaction. According to the phase state of the reaction system, it can be divided into homogeneous catalyst and heterogeneous catalyst, in which the homogeneous catalyst is acid, alkali, soluble transition metal compound and peroxide catalyst, and the heterogeneous catalyst is metal catalyst, biocatalyst, nanometer catalyst and so on.
And catalysts are widely used and play an important role in chemical production, scientists' experiments and life activities. Some industrial production, such as winemaking and pharmaceuticals, also require catalysts. So the development power of the catalyst is still considerable.


In medicine, auxiliaries are defined as excipients and additives used in the production and formulation of drugs, that is, the general name of all materials except the main active components of drugs, and is an important part of pharmaceutical preparations. In industrial production, auxiliary chemicals added to improve the production process, to improve product quality and output, or to give the product a unique application performance. Also known as additives. However, as an important component of the product matrix, high-dose supplements, which have a significant impact on the morphology, structure and properties of the product, generally do not fall into the category of auxiliaries. According to the function and function of auxiliaries, they can be divided into five categories: synthetic auxiliaries, cross-linking auxiliaries, functional auxiliaries, stability auxiliaries and process auxiliaries.
The auxiliaries should have good compatibility with the synthetic resin added, and can be stable and uniformly dispersed in the resin for a long time. When in use, plastic auxiliaries that can promote the function of each other should be selected as far as possible. to be able to use the requirements of the use of products, to be able to have good adaptability to processing conditions, to be able to disperse uniformly in the process of processing and molding, and must be durable and non-volatile. When using, we should also pay attention to the dosage of auxiliaries.
Most of the auxiliaries are dangerous chemicals, some are flammable and explosive, and some are toxic. The new technology has continuously improved the performance requirements of auxiliaries, which has promoted the rapid development of the auxiliaries industry, and is bound to enter a new era of technological innovation, increase in varieties, advanced performance and friendly environment. High efficiency, functionalization, compounding, refinement, specialization, serialization, energy saving and environmental protection have become the general trend of the development of modern adhesive additives.
Auxiliaries can also be divided into auxiliaries to improve processing properties, such as lubricants, stabilizers, processing aids, etc.; change mechanical properties, such as plasticizers, toughening agents, etc.; improve optical properties, such as pigments, dyes, etc.; improve aging properties, such as antioxidants, anti-mildew agents, etc.; improve surface properties, such as antistatic agents, wear resistant agents, etc.; reduce costs, such as diluents, solvents, fillers, etc. Improve other properties, such as foaming agent, combustion promoter, etc.

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2,2'-Azobis(2-methylpropionitrile)/AIBN used as initiator for polymers CAS 78-67-1
2,2'-Azobis(2-methylpropionitrile)/AIBN used as initiato...
  • FOB Price:15 USD/Kilogram 
  • Cas No:78-67-1 
  • Min.Order:1 Metric Ton 
  • Purity:99 
  • Supply Ability:100 Month/Metric Ton 
  • Formula:C8H12N4 
  • Payment:L/C,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 05 2019 
Hebei Yanxi Chemical Co.,Ltd
2YRS Main Products
Division I, the main production Lead acetate phenylacetamide Cyromazine quality is very good!
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IPTG
IPTG
  • FOB Price:1 USD/Kilogram 
  • Cas No:367-93-1 
  • Min.Order:1 Kilogram 
  • Purity:99.0%min 
  • Supply Ability:50 Month/Kilogram 
  • Formula:C9H18O5S 
  • Payment:L/C,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 01 2019 
Wuhan BJM Pharm Inc.
1YR Main Products
Pirfenidone;Letrozole;IPTG;DL-Homocysteinethiolactone hydrochloride;Tris Base;Cyclopropylboronic Acid;L-Carnosine;L-Cysteine;D(+)-Tryptophan;BP-6;UV-3035;UVT-150;Zinc pyrithione
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docusate sodium
docusate sodium
  • FOB Price:1 USD/Metric Ton 
  • Cas No:577-11-7 
  • Min.Order:1 Kilogram 
  • Purity:70% solution 
  • Supply Ability:100 Month/Metric Ton 
  • Formula:C20H37NaO7S 
  • Payment:L/C,D/P,T/T, 
  • Updatetime:Nov 02 2018 
Sodium p-toluenesulfonate / direct manufacturer CAS:657-84-1
Sodium p-toluenesulfonate / direct manufacturer CAS:657-84-...
  • FOB Price:  
  • Cas No:657-84-1 
  • Min.Order:1 Metric Ton 
  • Purity:78% 
  • Supply Ability:3000 Year/Metric Ton 
  • Formula:C7H8O3S 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Nov 02 2018 
Zibo Like Chemical Group Co., Ltd
3YRS Main Products
P-toluene sulfonic acid, sodium p-toluene sulfonic acid, oxalic acid, amino sulfonic acid, sodium sulfonic acid, p-toluene sulfonic acid mother liquor,disinfectants, disinfectant tablet.
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(3-(Glycidyloxy)propyl)trimethoxysilane
(3-(Glycidyloxy)propyl)trimethoxysilane
  • FOB Price:0.00 USD/Kilogram 
  • Cas No:2530-83-8 
  • Min.Order:1 Kilogram 
  • Supply Ability:100000 Month/Kilogram 
  • Formula:C9H20O5Si 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 08 2019 
Huangshan Violet Biotechnology Co., Ltd
1YR Main Products
silane-based pharmaceutical raw materials and pharmaceutical intermediates
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Monopotassium phosphite TOP1 supplier
Monopotassium phosphite TOP1 supplier
  • FOB Price:1 USD/Kilogram 
  • Cas No:13977-65-6 
  • Min.Order:1 Kilogram 
  • Purity:99%min 
  • Supply Ability:30 Year/Metric Ton 
  • Formula:H3KO3P+ 
  • Payment:L/C,T/T, 
  • Updatetime:Dec 08 2019 
Xiamen Zhongyuan Hongye Chemical Co., Ltd.
2YRS Main Products
pharmaceutical intermediates, biochemistry and customized chemicals, special chemicals, organic and inorganic chemicals, medical devices, electronic chemicals and biological sciences
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Chlorotris(triphenylphosphine)rhodium(I)
Chlorotris(triphenylphosphine)rhodium(I)
  • FOB Price:100 USD/Kilogram 
  • Cas No:14694-95-2 
  • Min.Order:1 Kilogram 
  • Purity:99% 
  • Supply Ability:100000 Quarter/Kilogram 
  • Formula:C54H45ClP3Rh 
  • Payment:L/C,D/A,T/T,Western Union, 
  • Updatetime:Nov 02 2019 
Hebei zhuangkai biotechnology co. LTD
2YRS Main Products
Pharmaceutical intermediates Pesticide intermediates Food Additives Custom synthesis
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53-43-0
53-43-0
  • FOB Price:1 USD/Gram 
  • Cas No:53-43-0 
  • Min.Order:1 Gram 
  • Purity:99 
  • Supply Ability:100 Month/Kilogram 
  • Formula:C19H28O2 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Oct 31 2019 
High quality Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate/TPO-L Cas 84434-11-7 with best price
High quality Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinat...
  • FOB Price:  
  • Cas No:84434-11-7 
  • Min.Order:25 Kilogram 
  • Purity:95%min 
  • Supply Ability:60 Year/Metric Ton 
  • Formula:C18H21O3P 
  • Payment:L/C,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 01 2019 
High purity, high quality 2-Methyl-4-(Methylthio)-2-Morpholinopropiophenone
High purity, high quality 2-Methyl-4-(Methylthio)-2-Morpholi...
  • FOB Price:10 USD/Metric Ton 
  • Cas No:71868-10-5 
  • Min.Order:1 Kilogram 
  • Purity:99% 
  • Supply Ability:100 Month/Metric Ton 
  • Formula:C15H21NO2S 
  • Payment:L/C,D/A,D/P,T/T,Western Union, 
  • Updatetime:Nov 02 2019 
tris(4-tert-butyl-3-hydroxy-2,6-dimethyl-benzyl)
tris(4-tert-butyl-3-hydroxy-2,6-dimethyl-benzyl)
  • FOB Price:  
  • Cas No:40601-76-1 
  • Min.Order: 
  • Supply Ability:  
  • Formula:C42H57N3O6 
  • Payment: 
  • Updatetime:Dec 05 2018 
Mesitylene
Mesitylene
  • FOB Price:1 USD/Gram 
  • Cas No:108-67-8 
  • Min.Order:1 Gram 
  • Purity:99%min 
  • Supply Ability:300 Month/Kilogram 
  • Formula:C9H12 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Nov 01 2019 
Jilin Tely Imp & Exp Co., Ltd
2YRS Main Products
Pharmaceutical raw materials,Chemical reagent, Food aditives,Plant ExtracPharmaceutical and pesticide intermediates.
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benzalkonium chloride
benzalkonium chloride
  • FOB Price:20 USD/Kilogram 
  • Cas No:8001-54-5 
  • Min.Order:10 Gram 
  • Purity:>99% 
  • Supply Ability:800 Month/Kilogram 
  • Formula:C21H38ClN 
  • Payment:Western Union,MoneyGram,BTC, 
  • Updatetime:Dec 07 2019 
Letrozole
Letrozole
  • FOB Price:1 USD/Kilogram 
  • Cas No:112809-51-5 
  • Min.Order:1 Kilogram 
  • Purity:99% 
  • Supply Ability:500 Year/Kilogram 
  • Formula:C17H11N5 
  • Payment:L/C,T/T,Western Union,TT, 
  • Updatetime:Nov 02 2018 
Jinlan Pharm-Drugs Technology Co., Limited
8YRS Main Products
Veterinary products,Nutrition products,Agrochemicals,Active pharmaceutical Ingredients,Custom systhesis,Contract manufacturing
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Oleic acid
Oleic acid
  • FOB Price:  
  • Cas No:112-80-1 
  • Min.Order:1 Metric Ton 
  • Supply Ability:1000 Month/Metric Ton 
  • Formula:C18H34O2 
  • Payment:L/C,T/T, 
  • Updatetime:Nov 02 2018 
Hangzhou Utanpharma biology co,.Ltd
3YRS Main Products
Our company is an internationally oriented research based pharmaceutical company with headquarters located in Hangzhou,China.
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sodium 3-amino-3-oxopropanoate
sodium 3-amino-3-oxopropanoate
  • FOB Price:  
  • Cas No:75993-39-4 
  • Min.Order:1 Gram 
  • Supply Ability:1 Day/Gram 
  • Formula:C3H4NNaO3 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGran, 
  • Updatetime:Dec 04 2017 
Nanjing Chemlin Chemical Co., Ltd.
9YRS Main Products
bulk commodities, lab agents, intermediates & fragments, special chemicals, agro-chemicals, APIs, natural ingredients
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cellulose
cellulose
  • FOB Price:1500 USD/Metric Ton 
  • Cas No:9012-19-5 
  • Min.Order:120 Metric Ton 
  • Purity:99.9% 
  • Supply Ability:500 Month/Metric Ton 
  • Formula:(C6H10O5)n 
  • Payment:L/C,T/T,Western Union,MoneyGran, 
  • Updatetime:Dec 08 2019 
Selenium Dioxide powder for Electrolytic Manganese Industry
Selenium Dioxide powder for Electrolytic Manganese Industry
  • FOB Price:21 USD/Kilogram 
  • Cas No:7446-08-4 
  • Min.Order:25 Kilogram 
  • Purity:99.5% 
  • Supply Ability:100 Month/Metric Ton 
  • Formula:O2Se 
  • Payment:L/C,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 05 2019 
Hebei Yanxi Chemical Co.,Ltd
2YRS Main Products
Division I, the main production Lead acetate phenylacetamide Cyromazine quality is very good!
Contact Supplier Chat With Supplier Chat With Skype
Integrity Supplier of Top Quality P-Toluene Sulfonic Acid PTSA
Integrity Supplier of Top Quality P-Toluene Sulfonic Acid PT...
  • FOB Price:  
  • Cas No:6192-52-5 
  • Min.Order:1 Metric Ton 
  • Purity:93% 95% 97% 99% 
  • Supply Ability:3000 Year/Metric Ton 
  • Formula:C7H8O3S 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Nov 02 2018 
Zibo Like Chemical Group Co., Ltd
3YRS Main Products
P-toluene sulfonic acid, sodium p-toluene sulfonic acid, oxalic acid, amino sulfonic acid, sodium sulfonic acid, p-toluene sulfonic acid mother liquor,disinfectants, disinfectant tablet.
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Bis(trimethoxysilylpropyl)amine
Bis(trimethoxysilylpropyl)amine
  • FOB Price:0.00 USD/Kilogram 
  • Cas No:82985-35-1 
  • Min.Order:1 Kilogram 
  • Supply Ability:100000 Month/Kilogram 
  • Formula:C12H31NO6Si2 
  • Payment:L/C,D/A,D/P,T/T,Western Union,MoneyGram, 
  • Updatetime:Dec 07 2019 
Huangshan Violet Biotechnology Co., Ltd
1YR Main Products
silane-based pharmaceutical raw materials and pharmaceutical intermediates
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