Seed preparation materials

The prepared oleaginous material is conveyed from the seed preparation process to the solvent extraction process and enters the solvent extractor. The solvent... 

To further illustrate the differences between the methods, Fig. 2 and 3 show the yield and the Si/Al ratio, respectively, of the zeolite as a function of time of crystallization for synthesis runned by the four methods. Obviously, it is not possible to compare synthesis with the same chemical compositions because of the differences of the methods. Accordingly, in Fig. 2 and 3 we compare synthesis runs that gave, for every method, high Si/Al ratios and high zeolite yields. In this figures it is seen how our "classical" syntheses of Ti-Beta zeolite (amorphous silica and TEOS methods) have been surpassed by the new, previously unpublished methods (TEOS/seed and cogel methods), if the Si/Al ratio of the zeolite and its yield are compared. Furthermore, the TEOS/seed method is the most versatile one in terms of varying the chemical composition of the zeolite, and thus we have prepared materials wich are essentially pure silica (A1 plus Ti contents below 0.2 atoms per unit cell of 64 tetrahedra). 

A novel process for the preparation of latex with high solid content, but maintaining the characteristics of microemulsion polymerisation latex, small particle size (less than 50 nm) and polymer with high molecular weight (more than 10 6) is presented. With the PS latex obtained by microemulsion polymerisation as seed, core shell, styrene-butyl acrylate polymers functionalised with itaconic acid are prepared. Materials were characterised by differential scanning calorimetry, dynamic mechanical thermal analysis and transmission electron microscopy. These polymers have better mechanical properties than the non functionalised or those prepared by emulsion polymerisation. 11 refs. 

Seed preparation, a-hematite (a-Fe203) sol particles were synthesized as seed materials by the MacCallum method (21). 22.7 grams of Fe(N03)3 9 H O was... 

The following preparation works excellently if it is carried out in a laboratory which has become inoculated by the methylglucoside from previous preparations, or alternatively if some of the glucoside is available for "seeding the solution of the crude material otherwise there may be a considerable delay before crystallisation starts. 

Precipitation of a hydrated titanium oxide by mixing aqueous solutions of titanium chloride with alkaU forms the precipitation seeds, which are used to initiate precipitation in the Mecklenburg (50) variant of the sulfate process for the production of pigmentary titanium dioxide. Hydrolysis of aqueous solutions of titanium chloride is also used for the preparation of high purity (>99.999%) titanium dioxide for electroceramic appHcations (see Ceramics). In addition, hydrated titanium dioxide is used as a pure starting material for the manufacture of other titanium compounds. 

The colorant is prepared by leaching the annatto seeds with an extractant prepared from one or more approved, food-grade materials taken from a hst that includes various solvents, edible vegetable oils and fats, and alkaline aqueous and alcohoHc solutions (46,47). Depending on the use intended, the alkaline extracts are often treated with food-grade acids to precipitate the annatto pigments, which ia turn may or may not be further purified by recrystallization from an approved solvent. Annatto extract is one of the oldest known dyes, used siace antiquity for the coloring of food, textiles, and cosmetics. It has been used ia the United States and Europe for over 100 years as a color additive for butter and cheese (48—50). 

Improved processes and quality control have helped to establish these new coating materials but the care necessary for successful use has to be appreciated. Sections 11.1 and 11.2 have shown how necessary it is to remove millscale before coating and how scale-free surfaces may still retain seeds of further corrosion even when apparently cleaned well. The percentage of premature failures with sophisticated systems is still high, even on apparently well-prepared surfaces and there is a strong case for effective inspection at each stage of coating operations. 

Thiourea and allylthiourea (20), D-xylulose (22), sodium diethyldithiocarbamate, L-methionine, and -propyl-di- -propylthiol-carbamate (163), 12 6-(substituted) purines (166), and two coumarin derivatives (164) have been found to promote Striga seed germination. None of these materials, however, appear to be constituents of the natural stimulant preparations. 

Five-membered sulfur-containing heterocycles are important synthetic intermediates and have found a variety of applications in medical, agricultural, and material chemistry. Looking for potential candidates for ferroelectric display applications. Seed s group investigated the preparation of liquid crystals... 

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