Solvent-fee synthesis process for organic dithiopyrophosphate flame retardant and apparatus thereof

A technology of dithiopyrophosphate and synthesis process, which is applied in the fields of organic chemistry, compounds of group 5/15 elements of the periodic table, chemical instruments and methods, etc., which can solve the problem of excessive use of solvents and other additives and unsustainable flame retardant effect , increase costs and other issues, to achieve the effect of reducing the workload of employees, improving the degree of automation and saving costs

Pending Publication Date: 2018-02-09
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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Problems solved by technology

[0003] As early as the 1930s, fire retardants have begun to be applied to the flame retardant treatment of cellulose fibers. These flame retardants are mainly fabric finishing flame retardants, which are easy to use, but the amount of additives such as solvents is large. And affect the performance, increase the cost, the flame retardant effect can not last

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  • Solvent-fee synthesis process for organic dithiopyrophosphate flame retardant and apparatus thereof
  • Solvent-fee synthesis process for organic dithiopyrophosphate flame retardant and apparatus thereof

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Embodiment Construction

[0022] Such as figure 1 The shown solvent-free synthesis equipment of organic dithiopyrophosphate flame retardant has a reactor, and the reactor has a neopentyl glycol inlet, a phosphorus trichloride inlet, a process water inlet, an exhaust gas outlet, or There is a pyridine inlet; the tail gas outlet of the reaction kettle is connected to a condenser and a jet pump in sequence, and the dilute alkali circulation tank is connected to the jet pump and communicated with each other to circulate and absorb hydrogen chloride tail gas.

[0023] An alkali storage tank is also provided, and the alkali storage tank is connected with the dilute alkali circulation tank to replenish the lye consumed therein. A supply pump is connected between the dilute alkali circulation tank and the alkali storage tank, a pH meter is installed in the dilute alkali circulation tank, and the pH meter and the supply pump form a chain adjustment relationship.

[0024] use as figure 1 The equipment shown us...

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Abstract

The invention provides a solvent-fee synthesis process for an organic dithiopyrophosphate flame retardant and an apparatus thereof. Neopentyl glycol and thiophosphoryl chloride as main raw materials undergo an acylation reaction stage and an esterification reaction stage, a small amount of the neopentyl glycol which is at about 50 DEG C is adopted as a solvent at the acylation reaction stage, thereaction temperature is 85 DEG C to 95 DEG C, and the pressure in a reaction kettle is negative 1KPa to negative 3KPa. A condenser and an injection pump are sequentially connected behind a tail gas outlet of the reaction kettle in the apparatus, and a dilute alkali circulating tank communicates with the injection pump and circularly absorbs hydrogen chloride tail gas. The solvent-fee synthesis process and the apparatus reduce material consumption cost and impurities, and the recovery rate of pyridine is high.

Description

technical field [0001] The invention belongs to the preparation technology of phosphorus-containing flame retardant. Background technique [0002] In traditional chemical reactions, solvents are the most commonly used reaction medium, because they can dissolve the reactants well to form a homogeneous system, so that the reaction can proceed smoothly. [0003] As early as the 1930s, fire retardants have begun to be applied to the flame retardant treatment of cellulose fibers. These flame retardants are mainly fabric finishing flame retardants, which are easy to use, but the amount of additives such as solvents is large. And affect the performance, increase the cost, the flame retardant effect can not last. for example: [0004] The first issue of 2010, "Chemical Engineer" "Synthesis and Characterization of Bis-Neopentyl Glycol Dithiopyrophosphate Flame Retardant", using neopentyl glycol and phosphorus trichloride as raw materials, xylene as solvent, in pyridine P , P '-bis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6574
CPCC07F9/657136
Inventor 石金砺郭建平马珍怀朱海桃吴晓伟
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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