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|Purity:||98%||Application:||Plant Growth Regulator,Plant Growth Hormone,Agriculture|
|State:||Powder,Liquid||Classification:||Plant Growth Regulator,Agrochemical / Pesticide,Biological Pesticide|
|Appearance:||White Powder,fine Powder||Storage:||Dry Place,Sealed Tightly And Stored Away From Light In A Cool And Dry Place,Keep In Cool And Dry Place,Dry And Shade Conditions|
|Shelf Life:||2~3 Years||Color:||White,white To Yellowish|
|Pd No.:||Plant Growth Hormone||Solubility:||Water,Soluble In Alcohol|
Maleic hydrazide plant growth stimulation,
23%SL root stimulator for trees,
Maleic hydrazide root stimulator for trees
Maleic anhydride is an organic compound with the formula C2H2(CO)2O. It is the acid anhydride of maleic acid.
It is a colorless or white solid with an acrid odor. It is produced industrially on a large scale for applications in coatings and polymers.
Maleic anhydride is produced by vapor-phase oxidation of n-butane.
The overall process converts the methyl groups to carboxylate and dehydrogenates the backbone.
The selectivity of the process reflects the robustness of maleic anhydride, with its conjugated double-bond system.
Traditionally maleic anhydride was produced by the oxidation of benzene or other aromatic compounds.
As of 2006, only a few smaller plants continue to use benzene.
In both cases, benzene and butane are fed into a stream of hot air, and the mixture is passed through a catalyst bed at high temperature.
The ratio of air to hydrocarbon is controlled to prevent the mixture from igniting.
Vanadium pentoxide and molybdenum trioxide are the catalysts used for the benzene route, whereas vanadium phosphate is used for the butane
route:C4H10 + 3.5 O2 → C4H2O3 + 4 H2O ∆H = −1236 kJ/mol
The main competing process entails full combustion of the butane, a conversion that is twice as exothermic as the partial oxidation.
The traditional method using benzene became uneconomical due to the high and still rising benzene prices and
by complying with the regulations of benzene emissions.
In addition, in the production of maleic anhydride (4 C-atoms) a third of the original carbon atoms is lost
as carbon dioxide when using benzene (6 carbon atoms).
The modern catalytic processes start from a 4-carbon molecule and only attaches oxygen and removes water;
the 4-C-base body of the molecule remains intact. Overall, the newer method is therefore more material efficient.
Parallels exist with the production of phthalic anhydride: While older methods use naphthalene, modern methods use o-xylene as feedstock.
|Identification||A.H-NMR:Comply with the structure||Complies|
|B.LC-MS:Comply with the structure||Complies|
|C.The IR spectrum of sample should be identical with that of reference standard;||Complies|
The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation, as obtained in the Assay.
|Heavy metals||≤10 ppm||<10ppm|
|Sulphated ash||≤0.5%, determined on 1.0 g.||0.009%|
|Related substances||Unspecified impurities: for each impurity||≤0.10%||<0.10%|
|Assay||99.0%~101.0% (anhydrous substance).||99.8%|
|Storage||Preserve in well-closed, light-resistant and airtight containers.||Complies|
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