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Disclosed are a crystalline trehalose dehydrate which has an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis less than 2.0, its preparation and uses. The crystal has insubstantial hygroscopicity and solidification, and satisfactory stability, free-

Disclosed are a crystalline trehalose dehydrate which has an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis less than 2.0, its preparation and uses. The crystal has insubstantial hygroscopicity and solidification, and satisfactory stability, free-flowing ability, and handleability; it can be easily processed without fracture in the drying and sieving steps.

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1. A process for producing crystalline trehalose dihyrdrate having an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis being less than 2.0, which process comprises: placing in a crystallizer a supersaturated aqueous trehalose solution with a trehalo

1. A process for producing crystalline trehalose dihyrdrate having an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis being less than 2.0, which process comprises: placing in a crystallizer a supersaturated aqueous trehalose solution with a trehalose content of at least 98 w/w %, on a dry solid basis;coexisting a crystalline trehalose dihydrate as a seed crystal;growing the crystalline trehalose dihydrate by cooling the mixture gradually to control the supersaturation degree to a level of less than 1.15; andseparating and drying the resulting mixture to collect the grown crystalline trehalose dihydrate.2. The process of claim 1, wherein said crystallizer is a cylindrical rotatory crystallizer, and said growing and cooling is carried out under rotatory motion.3. The process of claim 1, wherein the growing step of crystalline trehalose dihydrate is carried at a temperature of about 20 to about 90° C.4. In a process for producing a sweetener, a candy fluff, a baked confectionary, or an alcoholic beverage with fruit, comprising incorporating a first component into a material product,the improvement wherein said first component is a crystalline trehalose dihydrate produced according toclaim 1.5. A process for producing a composition, which process comprises incorporating a crystalline trehalose dihydrate having an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis of less than 2.0, and with a length in the c axis of at least 3 mm, into a material product, whereinsaid crystalline trehalose dehydrate is producible by:placing in a crystallizer a supersaturated aqueous trehalose solution with a trehalose content of at least 98 w/w %, on a dry solid basis;coexisting a crystalline trehalose dihydrate as a seed crystal;growing the crystalline trehalose dihydrate by cooling the mixture gradually to control the supersaturation degree to a level of less than 1.15; andseparating and drying the resulting mixture to collect the grown crystalline trehalose dihydrate.6. A method for growing crystalline trehalose dihydrate which has an elongated crystalline structure with a proportion of the length of the c axis to that of the b axis being less than 2.0, the c axis having a length of at least 3 mm, which process comprises: placing in a crystallizer a supersaturated aqueous trehalose solution with a trehalose content of at least 98 w/w %, on a dry solid basis;coexisting a crystalline trehalose dihydrate as a seed crystal; andgrowing the crystalline trehalose dihydrate by cooling the mixture gradually to control the supersaturation degree to a level of less than 1.15.7. The method of claim 6, wherein an about 0.01 to about 20 w/w % of said crystalline trehalose dehydrate, on a dry solid basis, is used as the seed crystal to the trehalose in the supersaturated aqueous trehalose solution, andsaid seed crystal has an elongated crystalline structure with a proportion of the length in the c axis to that in the b axis being less than 2.0.