A nano-tetragonal barium titanate and its process-enhanced continuous preparation method

By enhancing the microdroplet process and recycling wastewater, the problems of clogging, production capacity and wastewater treatment in the preparation of nano-barium titanate have been solved, realizing the mass green production of nano-barium titanate with small particle size and high purity, meeting the needs of high-end MLCC materials.

CN122324847APending Publication Date: 2026-07-03QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
Filing Date
2026-05-21
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies for preparing nano-barium titanate suffer from problems such as clogging risk, limited production capacity, high wastewater treatment costs, and low resource utilization, making it difficult to achieve large-scale green production with small particle size, high purity, and high tetragonal phase.

Method used

Microdroplet process enhancement technology is used to disperse a titanium-barium mixture and an ammonia solution into microdroplets smaller than 10 μm, enabling rapid mixing and reaction. Combined with the selective dissolution of ammonium chloride by methanol or liquid ammonia, wastewater recycling is achieved. Small-sized and high-purity nano-barium titanate is obtained through ball milling and nano-particle fluidized-sieve technology.

Benefits of technology

The method achieves small particle size and narrow distribution of barium titanate nanoparticles with high purity, high tetragonal distortion and strong ferroelectricity, which meets the requirements of high-end MLCC core dielectric materials, reduces production costs and wastewater discharge.

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Abstract

This application discloses a nano-tetragonal barium titanate and its process-enhanced continuous preparation method, belonging to the field of barium titanate preparation technology. The process-enhanced continuous preparation method for nano-tetragonal barium titanate includes the following steps: preparing a circulating mother liquor, a titanium tetrachloride acid hydrolysate, a barium chloride solution, and an ammonia solution; adding the titanium tetrachloride acid hydrolysate dropwise to the barium chloride solution to obtain a titanium-barium mixture; passing the titanium-barium mixture, the circulating mother liquor, and the ammonia solution into a microdroplet process-enhanced device for mixing and reaction; after heat preservation and aging, and solid-liquid separation, obtaining a mixed precipitate and a first filtrate; dissolving the mixed precipitate in a solvent, filtering to obtain barium oxalate tetrahydrate and a second filtrate; calcining the barium oxalate tetrahydrate to obtain nano-sized tetragonal barium titanate powder. By employing a microdroplet process-enhanced method, the titanium-barium mixture and the ammonia solution are dispersed into microdroplets smaller than 10 μm, enhancing the degree of material mixing, improving the mass transfer rate, and obtaining nano-barium titanate with small particle size and high purity.
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Citation Information

Patent Citations

  • CN110040770A

  • CN119637933A

  • CN120695740A

  • CN121695812A