Glyceryl-tri-

Lubrication AND lubricants). Optimal results are obtained at 130 5°C at a pressure of 1.5—2.0 MPa (15—20 bars) using 0.2 wt % nickel catalyst. Other catalysts and processing parameters may be used to produce unique derivatives. Simple double-bond hydrogenation at 140°C in the presence of Raney nickel catalyst produces glyceryl tris(12-hydroxystearate) [139-44-6], having a melting point of 86°C (46,47). 

For samples that meet the solubility requirements of the SEC approach, analyses were also reported for additives in polymers such as PVC and PS [28,29]. Direct SEC analysis of PVC additives such as plasticisers and thermal stabilisers in dissolution mode has been described [28,30,31 ]. In the analysis of a dissolved PS sample using a SEC column of narrow pore size, the group of additives was separated on a normal-phase column after elution of the polymer peak [21]. Column-loading capacity of HPSEC for the analysis of additives, their degradation products and any other low-MW compounds present in plastics has been evaluated for PS/HMBT, PVC/TNPP and PVC/TETO (glyceryl tri[l-14C] epoxyoleate) [31]. It was shown that HPSEC can be used to separate low-MW compounds from relatively large amounts of polymers without serious loss of resolution of the additives the technique has also been used for the group analysis of chlorohydrin transformation products of the TETO model compound [32]. 

TETO Glyceryl tri [l-14C]epoxyoleate ZnSt Zinc stearate... 

Ethyl benzoate, glyceryl tri-benzoate, etc., are prepared in an exactly similar manner. The reaction can also be applied to phenols and naphthols. 

Glycerol a-monochlorohydrin, c212 Glyceryl triacetate, p201 Glyceryl tris(laurate), g20... 

Saponification.—With a fat, which is a glycerol ester of a higher fatty acid, typified by glyceryl tri-palmitate, the reaction yields glycerol and the salt of the acid or acids, present, as follows ... 

Saponification Niunber, Koetstorffer Value.—When an ester is saponified the reaction is quantitative. In the case of a pure glycerol ester, e.g., glyceryl tri-palmitate, saponification is in accordance with the following reaction ... 

From the molecular weights of 806 for glyceryl tri-palmitate and of 56.1 for potassium hydroxide, the mass proportions are ... 

Glyceryl tri-palmitate Potassium hydroxide 806 168.3 Taking the mass of glyceryl tri-palmitate as i.oo the mass of potassium hydroxide becomes 0.2088. That is, to saponify 1.00 gm. of pure ester will require 0.2088 gm. of potassium hydroxide. Expressing... 

The organic nitrate nitroglycerin or glyceryl tri nitrate (GTN) a polyol ester of nitric acid was first synthesised in 1846 by Sobrero as an explosive and reported as a therapeutic agent in 1879 by Murrell for the relief and prophylaxis of angina pectoris. This was preceded by the use of the organic nitrite, amylnitrite, in 1857 for the treatment of angina and was the first described use of a nitrovasodilator. 

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