The content of phytin in hemp is 3.22%, in sunflower 2.01%, in castor plant 1.40%, in peanuts 1.13%, in flax 1.03%, in barley 0.74%, in wheat 1.52%, in rice 0.85%, in wastes from the production of rice 3.55%, in corn 0.96%, in peas 0.40%, in lentils 0.32%, and in soya 1.40%. Thus, the richest sources of raw material containing phytin are the wastes from the production of rice. It is known that aleuronic layer of the grain endosperm is very rich in phytin, and when grain is ground it passes mainly into the bran. In the current production of phytin, bran is used as the raw material, which comprises the wastes from the coarse grinding process of rice. For many years, the production was carried out by a method developed by Zokhre and Vedeneev [2]. In this method, phytin is extracted from thoroughly roasted rice bran by concentrated nitric acid. It is known that phytin can be partially decomposed by the action of concentrated acids [3], and at later stages of the technological process an unjustifiably large consumption of alkali is required to neutralize the medium. In the technology proposed by the authors of [2], the optimal pH values in the precipitation of the raw and end products and the washing conditions are not given. The yield of phytin did not exceed 50-60% of its content in the raw material. The aim of the present work was to decrease the solvents and power consumption, to shorten the duration of the technological cycle, and in the long run to increase the yield of the end product. EXPERIMENTAL In the production of rice groats, the grains are ground coarsely four times. We determined the content of phytin in each fraction. The results are given in Table i, which shows that wastes from the first and second coarse grindings are richest in phytin. The amount of wastes in each fraction obtained in mill installations is approximately the same. The mixed wastes of the first and second fractions were roasted to coagulate protein substances, and then were extracted by a 1% solution of nitric acid in a ratio of 1:3 [4]. The extract was separated from the siftings, which were washed by the same amount of water. The washings were combined with the extract, and phytin was precipitated by a 25% solution of ammonia at different pH values (Fig. i). The experiments showed that pH 7 is the optimal pH value for the precipitation of phytin from an acid solution. The precipitated raw phytin was separated from the mother liquor, and washed with water for 30 min to remove water-soluble impurities. For purification, the product obtained was dissolved again in a 10% solution of nitric acid in a ratio of i:I0, and thoroughly filtered. Phytin was precipitated from the filtrate with continuous stirring. The mixture of the precipitate and the mother liquor was diluted with water in a ratio of i:i. The precipitated pharmacopoeia-grade phytin was separated, washed with cold water for 1 h, and dried at 80~ for 10-12 h. The consumption of water for washing at the stage of the preparation of raw and pharmacopoeia-grade phytin is 50 liters per kg of the finished product. Previously 75 liters of water were required per kg of finished product. The yield of the end product was 80% of its initial content in the raw material. The phytin obtained satisfies the requirements of State Pharmacopoeia X of the USSR.