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A kind of production method of dipotassium hydrogen phosphate by-product lettuce special fertilizer

A technology of dipotassium hydrogen phosphate and production method, which is applied in the directions of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc. problems, to achieve significant environmental protection value and economic benefits, production cost reduction, production cost reduction effect

Inactive Publication Date: 2016-08-17
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many preparation processes for dipotassium hydrogen phosphate, but most of them have low purity of the produced products, and further impurity removal treatment is required, which makes the production cost higher, the tail liquid discharge volume of the production process is large, and the loss of phosphorus and potassium elements is large. and other features

Method used

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  • A kind of production method of dipotassium hydrogen phosphate by-product lettuce special fertilizer
  • A kind of production method of dipotassium hydrogen phosphate by-product lettuce special fertilizer
  • A kind of production method of dipotassium hydrogen phosphate by-product lettuce special fertilizer

Examples

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Effect test

Embodiment 1

[0049] A production method for preparing dipotassium hydrogen phosphate by-product lettuce special fertilizer, comprising the following steps:

[0050] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 1.6:1, raise the temperature to 85°C at a heating rate of 15°C / min, and control the stirring rate of the stirring tank to 170r / min to stir Mixing reaction 3h, obtain intermediate slurry;

[0051] (2) Preparation of K 2 HPO 4 : Add 2.4mol of alkaline potassium salt into the reaction kettle containing the intermediate slurry prepared in step 1) at a uniform speed for 2h, and control the reaction temperature to be 55°C, stir and react for 30min, and when the pH value is detected to be 8, the reaction ends , to obtain slurry containing nitrogen, phosphorus and potassium;

[0052] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a coo...

Embodiment 2

[0058] A production method for preparing dipotassium hydrogen phosphate by-product lettuce special fertilizer, comprising the following steps:

[0059] (1) Preparation and mixing of raw materials: put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 2.1:1, raise the temperature to 105°C at a heating rate of 15°C / min, and control the stirring speed of the stirring tank to 205r / min to stir Mixed reaction 5h, obtain intermediate slurry;

[0060] (2) Preparation of K 2 HPO 4 : Add 2.8mol of alkaline potassium salt 3h at a uniform speed into the reaction kettle containing the intermediate slurry prepared in step 1), and control the reaction temperature to be 85°C, stir and react for 60min, and when the detected pH value is 9.5, the reaction ends , to obtain slurry containing nitrogen, phosphorus and potassium;

[0061] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a cooling cr...

Embodiment 3

[0067] A production method for preparing dipotassium hydrogen phosphate by-product lettuce special fertilizer, comprising the following steps:

[0068] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 1.7:1, raise the temperature to 95°C at a heating rate of 15°C / min, and control the stirring rate of the stirring tank to 180r / min to stir Mixed reaction 4h, obtain intermediate slurry;

[0069] (2) Preparation of K 2 HPO 4 : Add the alkaline potassium salt of 2.6mol into the reaction kettle containing the intermediate slurry prepared in step 1) at a uniform speed for 2.5h, and control the reaction temperature to be 65° C., stir and react for 40min, and detect that the pH value is 8.5. End, obtain the slurry containing nitrogen, phosphorus and potassium;

[0070] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a cooling crystall...

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Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing dipotassium hydrogen phosphate and preparing a special fertilizer for lettuce as a byproduct. The effective absorption amounts of N, P and K elements are analyzed according to fertilizer requirements of lettuce, and the contents of elements in the production process are adjusted and matched to make the prepared compounded composite fertilizer maximally meet the demands of lettuce, so the too high cost caused by improper matching of the elements in the production of the composite fertilizer is avoided, and environmental pollution caused by solidification of the composite fertilizer due to the addition of excess elements into soil is further avoided.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing special fertilizer for dipotassium hydrogen phosphate by-product lettuce. Background technique [0002] Lettuce (scientific name: Lactuca sativa), also known as lettuce, spring vegetable, wheat vegetable, is one of the annual or biennial herb plants of Lactuca in the Compositae family. It is a very common edible vegetable; and the lettuce stems and leaves contain rich nutrients. According to Detection: every 100 grams contains 96.4 grams of water, 0.6 grams of protein, 0.1 grams of fat, 1.9 grams of carbohydrates, 0.4 grams of crude fiber, 7 mg of calcium, 31 mg of phosphorus, 2 mg of iron, 0.02 mg of carotene, and 0.03 mg of thiamine , riboflavin 0.02 mg, nicotinic acid 0.5 mg; which also contains a special nutrient - "lettuce", which has a bitter taste, can enhance gastric juice, stimulate digestion, increase appetite, and has the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙朱飞武薛涛彭宝林李军旗黄芳金会心唐晓宁
Owner GUIZHOU UNIV
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