CN85109580A - The long-acting urea fertilizer and the manufacturing process thereof that contain Resorcinol - Google Patents

Abstract

A kind of long-acting urea fertilizer that contains urease inhibitor and urea or urea derivative is characterized by in urea or urea derivative the Resorcinol that adds (calculating by weight percentage) 0.05～0.30.The present invention also provides the production technique of the long-acting urea fertilizer that a kind of manufacturing contains Resorcinol and has produced specific equipment, this mainly is before the carbamide granulation operation, increase the mixed processes of one Resorcinol liquid and urine, say on the slave unit, only need to set up two solution mixers, a Resorcinol storage tank and two liquid urine.Long-acting urea fertilizer provided by the present invention is comparable common urea with increased yield 6～20% in field experiment.

Description

The long-acting urea fertilizer and the manufacturing process thereof that contain Resorcinol

The invention belongs to the fertilizer that contains urea or urea compounds and the field of manufacturing process thereof, a kind of long-acting urea fertilizer and manufacturing process thereof that contains Resorcinol promptly is provided.

Urea fertilizer has become most important a kind of solid nitrogenous fertilizer in the world agriculture, and its turnout comes compared with other nitrogenous fertilizer just in sharp increase at present, and urea fertilizer has many advantages; The nitrogen content height, cost is low, and is soluble in water and be easy to handle.Also be suitable for producing compound manure, except that making base manure concerning some crop, can also be used as foliage application, yet, using urea fertilizer and also exist some that problem to be solved is arranged, mainly is that urea fertilizer can be hydrolyzed into amine carbonate rapidly in soil, can cause on the one hand the accumulation with amine of increasing of P in soil H value, produce the murder by poisoning of nitrite and ammonia, this makes plant particularly serious for the seedling and the children of germinateing; Urea vapors away in a large number with gaseous form after changing ammonia on the other hand, and its wastage rate can reach more than 50%.

Be the nitrogen loss of the urea of minimizing in being manured into soil, people taked number of ways to study controlled availability fertilizer, promptly were urea to be unlikely in a short time directly contact with water with soil, or allowed it work with soil and water lentamente.Like this, a large amount of urea fertilizer in once being manured into soil can manage to make crop that a large amount of urea supplies is arranged in whole growing sustainedly and stably, to reduce topdressing operation.Making long-acting urea fertilizer the simplest is by the slow dissolubility plastic film of multiple last layer (promptly producing bag by urea) outside urea granules, next is to seek not that the urea derivative of facile hydrolysis replaces urea itself to use as fertilizer, to reduce the volatilization loss of nitrogen in the urea.Long-acting urea fertilizer in the market has: sulfur coated urea, plastic coated fertilizer, urea derivative or contain the fertilizer of urea derivative (as urea formadehyde, rare fork two ureas of fourth, IBDU) and use the urea of nitrification inhibitor, its cost of above measure is all than higher, but, reduce urea decomposition speed and volatilization loss and do not receive well-content effect improving the urea utilization ratio.Yet, some scholars find that it mainly is the effect of urase in the soil that urea decomposes in soil in recent years, thereby the activity that proposes the inhibition urase just can be controlled the opinion of the hydrolysis rate of urea effectively, this has also just opened up the long lasting urea fertilizer novel process of a kind of manufacturing approach, promptly explores the long-acting urea fertilizer that adds urease inhibitors.

On the other hand, in recent years, particularly in last decade, the progress of countries in the world urease inhibitors is very fast, wherein has more than 100 kind of compound to patent.But up to the present, the research many places of this respect are in the starting stage, and their majority is that urease inhibitor and urea are added respectively, perhaps both are given machinery (solid particulate) mixing adding crop is tested.The result who yet there are no field experiment reports and adds the appearance of the long-acting urea fertilizer of urease inhibitor.

The present invention is on the basis of systematically studying urease inhibitor, contrasted the production cost of various inhibitor, the every indexs such as effect that suppress urease activity, integrated optimization goes out Resorcinol as urease inhibitor, and a kind of long-acting urea fertilizer and manufacturing process thereof that contains Resorcinol proposed, it is characterized in that adopting the mixture of Resorcinol and urea or urea derivative (the following urea that all abbreviates as) to make long-acting urea fertilizer, Resorcinol addition (calculating by weight percentage) in urea is 0.05～0.30.Its production technique can adopt the urea production process of present use, just after the urea synthesis operation of this technology, before the granulating working procedure, the Resorcinol aqueous solution that dissolving in advance is good, ratio and urine in prescription enter in the mixing tank simultaneously, both are fully stirred, after mixing, make the long-acting urea fertilizer that contains Resorcinol through granulating working procedure.

The long-acting urea fertilizer that contains Resorcinol provided by the present invention, only the comparable common urea with increased yield of field experiment reaches 6～20%, and how much complicated its manufacturing process is unlike common urea production process; And the saving of Resorcinol consumption is very much considerable.This appearance that contains the long-acting urea fertilizer of urease inhibitor, not only brought volume increase to agriculture production, saving of labor, the benefit that joint is fertile, brought good news also for the producer of production urea fertilizer and the manufacturer of Resorcinol, for the product of these producers has been opened market, both increased the profit of urea and corresponding chemical enterprise, also made new contribution for the Agricultural Development of China.

Manufacturing process provided by the present invention, because it is only in (promptly before the carbamide granulation operation) on the basis of original urea synthesis production technique, Resorcinol liquid and urine blended operation have been increased, it just sets up two mixing tanks (being the usefulness that Resorcinol liquid and urine mix), a Resorcinol liquid storage tank and two liquid pumps on the slave unit.Urine before the granulating working procedure is entered first mixing tank by formula rate earlier and by the next Resorcinol liquid of Resorcinol liquid storage tank, pump into again in second mixing tank, enter granulating working procedure again by after fully mixing through mixing.

One of its specific embodiment of long-acting urea fertilizer manufacturing process that contains Resorcinol provided by the present invention as shown in Figure 1, Fig. 1 is for adopting the technical process and the equipment layout synoptic diagram of general production of urea with full circulation of aqueous solution.(1) wherein is NH ₃With CO ₂Mixing tank, (2) be synthetic tower, (3) for giving separator, (4) be middle pressure decomposition heater, (5) be middle pressure separator decomposition, (6) be the low pressure decomposition heater, (7) be low-pressure distillation tower, (8) are the low pressure separator decomposition, and (9) are the urine flash drum, (10) be Resorcinol liquid storage tank, (11) be the Resorcinol liquid pump, (12) are first mixing tank of Resorcinol liquid and pump urine, and (13) are the liquid pump (hereinafter to be referred as liquid pump) of Resorcinol liquid and urine, (14) be Resorcinol liquid and urine second mixing tank (hereinafter to be referred as mixing tank), (15) for containing the urine storage tank (hereinafter to be referred as storage tank) of Resorcinol, (16) for containing the urine pump of Resorcinol, (17) are strainer, (18) be primary evaporator heater, (19) be one section vapor seperator, (20) are two-section evaporating heater, and (21) are the dual circulation separator, (22) for containing the melt and dissolved urine pump of Resorcinol, (23) are prilling tower.The prior art that above-mentioned (1)～(9) are possessed for the original production urea technique, part of the present invention is to be provided with two mixing tanks in urine flash drum bottom, a Resorcinol liquid storage tank and two liquid pumps, wherein the inlet of first mixing tank communicates by the outlet of a liquid pump and Resorcinol liquid bath, its outlet then links to each other with second mixing tank through second liquid pump, second mixing tank communicates with the urine storage tank, below again through (16)～operations such as (23) also for holding within the prior art.

Accompanying drawing 2 is a Resorcinol liquid storage tank (10), and this equipment can be made by the nickel chromium stainless steel material, and in process of production, the Resorcinol liquid that raw material workshop section comes is entered in this groove by storage tank upper inlet (24), and is entered in the mixing tank through liquid pump by outlet (25).This storage tank is provided with liquidometer hole (26), with the usefulness of liquid level in the control flume.For preventing that temperature from descending, U type tubular heater is arranged at the groove bottom, and steam is entered by calorifier inlets (27), and phlegma is discharged by condensate outlet (28).At any time can open access opening and allow and overhaul and clear up in maintenance worker's groove for overhauling the convenient access opening (29) of can establishing.For keeping temperature in the groove, outside groove, need to take good insulation measure.

Accompanying drawing 3 is that the equipment (12) among Fig. 1 is the mixing tank (abbreviation mixing tank) of Resorcinol liquid and urine, (30) are agitator among the figure, and (31) are step-down gear, and (32) are urine inlet, (33) be Resorcinol liquid inlet, (34) are the outlet of Resorcinol liquid and urine mixture.In process of production, urine by flash drum is after metering from urine inlet, respectively enter mixing tank through the metering back from Resorcinol liquid inlet with Resorcinol liquid, fully stir and enter second mixing tank with the agitator in the mixing tank and mix once more through liquid pump.The structure of second mixing tank and function and first mixing tank are identical, adopt two mixing tanks to mix, and can guarantee that Resorcinol liquid and urine thorough mixing are even.

The process for producing long effect urea that contains Resorcinol provided by the present invention, be not only applicable to the general water solution total cycling method flow process in the foregoing description 1, also be applicable to improved water solution total cycling method flow process, as Kai Mikefa, Meng Teaidi think of a way, Mitsui recycle to extinction improved method (comprising G method and D method) etc., concerning the latter, the mixed processes that all only needs to increase to the granulating working procedure in urine outlet back one Resorcinol and urine gets final product, its embodiment is also identical with embodiment 1, promptly sets up two mixing tanks, a Resorcinol stationary tank and two liquid pumps.

The process for producing long effect urea that contains hydroquinones provided by the present invention also is applicable to the technologies such as air lift method flow process, gas separating method (C, P, I combination method) and thermal cycling method that existing urea is produced, its embodiment also is the mixed processes that increases by one hydroquinones and urine between urine outlet and prilling, as long as on equipment, also set up two blenders, a hydroquinones hopper and two liquid pumps, all need not to give one by one repeated description at this. In a word, the process for producing long effect urea that contains hydroquinones provided by the present invention can be with existing various urea production workers The skill broad incorporation, its embodiment is fairly simple, is easy to be promoted in urea industry application.

Claims (3)

1, a kind of long-acting urea fertilizer that contains urease inhibitor and urea or urea derivative is characterized in that taking Resorcinol to make urease inhibitor, and its addition (calculating by weight percentage) in urea and urea derivative is 0.05～0.30.

2, a kind of being exclusively used in made the described production technique that contains the long-acting urea fertilizer of urease inhibitor of claim 1, it takes the existing technical process of urea synthesis, it is characterized in that before the granulating working procedure of urea, increased the mixed processes of one Resorcinol liquid and urine.

3, a kind of being exclusively used in implemented the described specific equipment that contains the long-acting urea fertilizer production technique of urease inhibitor of claim 2: it is characterized in that it is made up of two solution mixers, a Resorcinol liquid storage tank and two liquid urine.

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