Environment friendly process for biodiesel

Abstract

The invention discloses environmental protection technology for bio-diesel production, which comprises the following units: 1) raw material preparation; 2) pre-esterification; 3) fine esterification; 4) washing desulphurization esterification; 5) refined methyl ester separation; 6) low-temperature dewaxing; 7) emission recovery; and 8) wastewater treatment. The environmental protection technology has the advantages that: 1. energy saving and emission reduction: the low temperature is served as technology heat and reduces the consumption of the energy; after the unit separation and purification, the produced exhaust gas and waste liquid can be reused in the technology, thus reducing the pollution emissions; 2. rapid esterification speed: high esterification rate; the hydrous grease is separated promptly by a liquid separating tank, thus avoiding a reverse reaction and reducing the esterification time to 1 hour; the acid value recovery problem is solved, so that the esterification is more thorough; the esterification rate can reach more than 98%; 3.output improving: the environmental protection technology has compact technology and reasonable procedure and can realize continuous and large-scale flowing production; and 4. low bio-diesel solidifying point: the wax in the bio-diesel is removed effectively by using a jacketed crystallizer and a full-automatic pressing filter, and the solidifying point is reduced.

Description

1. Technical field [0001] The invention belongs to the technical field of biodiesel, and in particular relates to an environment-friendly process for producing biodiesel from fatty acids. 2. Background technology [0002] In recent years, with the soaring price of oil, the shortage of energy sources, the depletion of oil resources and the improvement of people's awareness of environmental protection, the research and development of biodiesel has attracted widespread attention. Biodiesel refers to a liquid fuel made from fatty acids, which is close to or higher than ordinary diesel in terms of total calorific value, low temperature fluidity, storage stability, combustion performance, rubber compatibility and environmental protection, and can meet the needs of high-end vehicles. and equipment requirements. Currently, biodiesel is produced by transesterification. But this method has the following deficiencies in the production process: 1, the amount of pollution discharge is ...

AI Technical Summary

Problems solved by technology

But this method has the following deficiencies in the production process: 1, the amount of pollution discharge is large: the sulfuric acid, esterified water, alcohol and oil mixture after the esterification process of the method cannot be effectively processed, and most of them are directly discharged, causing environmental pollution; 2. The esterification speed is slow and the esterification rate is low: due to the inability to solve the reverse reaction problem, the water generated by the esterification cannot be removed in time, resulting in an esterification time of about 6 hours

At the same time, high-temperature distillation will also cause secondary oxidation, which greatly reduces the esterification rate. In actual production, the esterification rate is only between 80% and 90%, which is difficult to meet the requirements of the national BD100 standard; 3. Large energy consumption: due to the high temperature Esterification and high-temperature distillation consume a lot of energy, and the coal consumption for producing 1 ton of biodiesel is as high as 200 kilograms; 4. Low output: Since the existing production methods are all intermittent or semi-intermittent, it is impossible to form a continuous large-scale operation, the continuous output capacity is poor, the output is low, and the daily output is only 10-30 tons, which is difficult to meet the requirements; Between 5-15°C, it cannot be used as a practical diesel at all