Anti-crystallization marine urea and method of preparation

CN121648737BActive Publication Date: 2026-04-28DALIAN ECONOMY & TECH DEV ZONE LIJIA CHEM PRODS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN ECONOMY & TECH DEV ZONE LIJIA CHEM PRODS
Filing Date
2026-02-06
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

Marine urea is prone to crystallization at low temperatures, leading to pipeline blockage and injection system malfunctions. Existing anti-crystallization agents affect its stability.

Method used

L-theanine is reacted with a complex acid solution to generate a polymer with hydrogen bonds and steric hindrance, which is then combined with modified aramid fibers to form a stable composite structure. Through the synergistic effect of additives A and B, urea crystallization is inhibited and dispersion stability is improved.

Benefits of technology

It effectively inhibits urea crystallization at low temperatures, maintains good dispersion stability and metal corrosion inhibition, and meets the requirements for long-term reliable operation of the ship's selective catalytic reduction technology system.

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Abstract

The application relates to the technical field of urea, in particular to an anti-crystallization marine urea and a preparation method thereof, which comprises the following raw materials in parts by weight: 320-335 parts of urea, 665-680 parts of deionized water, 5-15 parts of an additive A, 1-5 parts of an additive B, 0.5-2 parts of an inhibitor and 0.1-0.5 parts of a pH stabilizer. In the application, the additive A is polymerized with 2-acrylamide-2-methylpropanesulfonic acid by forming an intermediate from L-theanine and a complex acid solution, so that a polymer structure with steric hindrance and hydrogen bonding is formed, the ordered arrangement of urea molecules can be interfered, and the formation and growth of crystal nuclei are inhibited; the additive B is aramid fiber modified by shellac, hydrophobic segments and rigid aromatic ring structures are introduced in the preparation process, the solution dispersion stability can be improved, a barrier can be formed at the urea crystallization interface, the crystallization process is delayed, and the anti-crystallization performance of the marine urea is effectively improved.
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Citation Information

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