The invention relates to
chitin extraction, in particular to a method for cleaning comprehensive utilization of
shrimp and crab shell waste. The method includes the steps of
steam explosion, wherein
shrimp shells and / or crab shells are soaked in water, placed in
steam explosion equipment, treated at 1.4MPa-2.4MPa for 60-600s, dried and crushed; decalcification, wherein
shrimp shell and / or crabshell
powder is treated with a decalcifying agent at 20-80 DEG C for 60-300min, filtering is conducted, a filtrate A is obtained, a
solid material is washed with water, and
drying is conducted; deproteinization, wherein the shrimp shell and / or crab shell
powder is treated with a lye at 60-100 DEG C for 90-300min, filtering is conducted to obtain a filtrate B, the
solid material is washed with water, and
drying is conducted; the shrimp shells and / or the crab shells are treated according to the sequence of the
steam explosion, the decalcification and the deproteinization or the steam explosion, the deproteinization and the decalcification to obtain the
chitin. The method improves the separation efficiency of the
chitin and reduces the amount of acid and alkali and waste
discharge.