method for the manufacture of a hydroxypropylated starch or hydroxypropylated / cross-linked starch, method for reducing the amount of propylene-chlorohydrin, and, method for the manufacture of a hydroxypropylated hydrocolloid.

摘要

the present invention relates to a method of reducing the amount of propylene chlorohydrin produced in a reaction to produce a hydroxypropylated / crosslinked starch comprising removing residual propylene oxide from the alkaline slurry. residual propylene oxide is removed by dehydrating the alkaline slurry or by washing the slurry at a pH of about 10. the starch is then neutralized in an acidic solution and recovered from the second slurry and may or may not be washed depending on whether the slurry is at a pH of about 10 to produce a hydroxypropylated / crosslinked starch having less than 1 ppm of propylene chlorohydrin.