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Hydrolysis process for preparing humic acid (HA) from corn straw

A humic acid and corn stalk technology, applied in organic fertilizers, organic chemistry and other directions, can solve the problems of high catalytic acid concentration, long heating time and long reaction period, and achieve the effects of high content, easy operation and strong biological activity.

Inactive Publication Date: 2010-04-07
HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the existing technology for preparing humic acid from straw oxidation include: long reaction cycle, high concentration of catalytic acid, low yield, long heating time, energy waste, etc.

Method used

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  • Hydrolysis process for preparing humic acid (HA) from corn straw
  • Hydrolysis process for preparing humic acid (HA) from corn straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 300 grams of air-dried corn stalks are crushed through a 20-mesh sieve, put into a high-temperature and high-pressure reactor, and a sulfuric acid solution with a mass percentage concentration of 0.1% is added according to the solid-to-liquid ratio of 1:0.8, and the stirrer speed is 300 rpm. React for 30 minutes, condense and cool down to 70°C, stirrer speed is 300rpm, react for 30 minutes, collect the residue in the kettle, dry and pulverize at 60°C, pass all through a 2.5 mm sieve, and use 1% of the mass percentage concentration at room temperature Sodium hydroxide solution is used as the extractant, the solid-to-liquid ratio is 1:12.5, shake and extract for 30 minutes, centrifuge at 2500rpm for 20 minutes, take the supernatant, adjust its pH value to 2 with concentrated hydrochloric acid for acidification, shake for 0.5 hours, filter Take the solid sample, then add 1mol / L sodium hydroxide solution according to the solid-liquid ratio of 1:10, shake for 30 minutes, let ...

Embodiment 2

[0019] Crush 300 grams of air-dried corn stalks through a 20-mesh sieve, put them into a high-temperature and high-pressure reaction kettle, add a sulfuric acid solution with a mass percentage of 0.05% according to the solid-to-liquid ratio of 1:10, and react at 220°C at a stirrer speed of 300 rpm For 30 minutes, condense and cool down to a temperature of 70°C, the speed of the agitator is 200rpm, react for 30 minutes, collect the residue in the kettle, dry and pulverize at 60°C, and pass through a 2.5mm sieve. The solution is the extractant, the solid-to-liquid ratio is 1:10, shake and extract for 40 minutes, centrifuge at 3500rpm for 30 minutes to get the supernatant, adjust its pH value to 2 with concentrated hydrochloric acid for acidification, shake for 0.5 hours, filter to get a solid sample, Then add 1mol / L sodium hydroxide solution according to the solid-liquid ratio of 1:10, shake for 30 minutes, let stand for 8-10 hours, centrifuge the extract at 3000rpm for 20 minute...

Embodiment 3

[0021]Crush 300 grams of air-dried corn stalks through a 20-mesh sieve, put them into a high-temperature and high-pressure reactor, add a sulfuric acid solution with a mass percentage of 0.1% according to the solid-to-liquid ratio of 1:12, and react at 220°C at a stirrer speed of 300 rpm For 20 minutes, condense and cool down to a temperature of 70°C, the speed of the agitator is 300rpm, react for 30 minutes, collect the residue in the kettle, dry and pulverize at 60°C, pass through a 2.5 mm sieve, and use 2% sodium hydroxide as a mass percentage at room temperature The solution is the extractant, the solid-to-liquid ratio is 1:12.5, shake and extract for 30 minutes, centrifuge at 3500rpm for 30 minutes to take the supernatant, adjust the pH value to 2 with concentrated hydrochloric acid for acidification, shake for 0.5 hours, filter to take the solid sample, Then add 1mol / L sodium hydroxide solution according to the solid-liquid ratio of 1:10, shake for 30 minutes, let stand f...

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Abstract

The invention relates to a hydrolysis process for preparing humic acid (HA) from corn straw. The HA is prepared from the raw material of the corn straw with the chemical oxidation and hydrolysis technology by taking less than 0.1 percent sulfuric acid at catalyst to regulate the solid-liquid ratio, the reaction temperature, the reaction time and the reactor stirring speed at different steps during the hydrolysis reaction of 50-60 min with the segmented temperature control method and then taking sodium hydroxide as solvent and hydrochloric acid as precipitate to regulate the concentration, the solid-liquid ratio, the reaction time and the like so as to purify the HA. The HA for agricultural production has characteristics of high content and good quality and can stimulate the growth of the crops and improve the soil nutrient utilization ratio. The HA has such technical index as the concentration of 50-85 percent, the pH value of 4.5-6.5 and the dry ash of 10-18 percent.

Description

technical field [0001] The invention relates to a hydrolysis process for preparing humic acid from corn stalks. Background technique [0002] At present, agricultural humic acid in my country is mostly extracted from peat, weathered coal, and lignite, and its preparation requires mining of natural resources, which is likely to cause environmental pollution and ecological damage. The production of humic acid from straw is mostly a fermentation method. The humic acid is extracted after the straw is degraded by bacteria. The cycle is long, the conditions are harsh, and the product is unstable. The disadvantages of the existing technology for preparing humic acid by oxidation from straw include: long reaction cycle, high concentration of catalytic acid, low yield, long heating time, energy waste and other problems. Contents of the invention [0003] The purpose of the present invention is the hydrolysis process for preparing humic acid from corn stalks, which can greatly redu...

Claims

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Application Information

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IPC IPC(8): C07G99/00C08H5/00C05F11/02
Inventor 吕品于志民沈光周琳孙彬马献发王立民曹宏杰张继舟王宏韬袁磊
Owner HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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