A kind of coproduction method of citrus peel essential oil and pectin

Abstract

A method for orange peel essential oil and pectin combined production. The method comprises the following steps of immersing peels of oranges of which pulp is processed into a canned food in mixed hardening liquid containing 0.5 to 1.2 % of calcium chloride, steeping the peels in the mixed hardening liquid for above 12 hours, squeezing the steeped peels by a roller squeezer to obtain orange peel residues and mixed liquid of orange oil and water, feeding the orange peel residues into an extraction barrel, adjusting a PH value of the orange peel residues to a pH value of 2 to 2.5, boiling the orange peel residues obtained from the previous step at a temperature of 95 DEG C for 42 to 48 minutes, carrying out extraction, separation, salting out, filtration, desalination, washing, drying and crushing processes on the boiled orange peel residues to obtain pectin, and carrying out filtration, centrifugation, deposition, low-temperature storage and re-filtration processes on the mixed liquid of orange oil and water to obtain orange peel essential oil. The method realizes orange peel essential oil and pectin combined production through adopting a raw material of peels of oranges of which pulp is processed into a canned food. The method realizes orange peel essential oil and pectin combined production through adopting a raw material of peels of oranges of which pulp is processed into a canned food, improves a resource utilization rate, reduces environmental pollution, has obvious economical and social benefits and produces favorable effects.

Description

technical field [0001] The invention relates to a coproduction method for extracting citrus peel essential oil and pectin in citrus pulp processing, and belongs to the technical field of agricultural by-product processing. Background technique [0002] Citrus peels are rich in essential oils and pectin, which can be used as important chemical raw materials and food additives after extraction. The technology of extracting pectin or essential oil from citrus peel alone is relatively mature. At present, the technology for large-scale industrial extraction of essential oils from citrus peels is the pressing method. In order to increase the yield of essential oils, the current technology mainly treats citrus peels with lime, so that the pectin in the citrus peels combines with calcium ions in the lime to form calcium pectate. Increase the hardness of the orange peel to improve the squeezing effect, while reducing the viscosity of the squeezed liquid, which is beneficial to the s...

AI Technical Summary

Problems solved by technology

Because the alkalinity of lime will cause the degradation of the molecular weight of pectin, and the calcium ions in lime combine with pectin to form calcium pectate, which cannot be extracted by traditional hydrochloric acid method, so the citrus peel after lime treatment is not suitable for the production of pectin. raw material

The two citrus peel utilization technologies cannot be connected, and the economic value of citrus peel processing and utilization has been greatly reduced, resulting in a great waste of resources and environmental pollution

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