Titanium MWW Zeolite Spray Drying Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing processes for preparing titanium-containing zeolitic materials with an MWW framework structure are hindered by long crystallization times and the need for filtration, which increases the overall duration and complexity of the process, especially at industrial scales.
Innovation Solution
A process involving the hydrothermal incorporation of titanium into a deboronated zeolitic material with a specific amount of template compound, followed by spray-drying the mother liquor, which reduces crystallization time and eliminates the need for filtration, and includes pH adjustment to improve filtration characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If filtration is used to separate the titanium-containing zeolitic material from the mother liquor, then the material can be isolated and dried, but the overall preparation time increases
Solution Approach 1:
The patent combines the separation and drying operations into a single spray-drying step. The mother liquor containing the titanium-containing zeolitic material is directly fed into a spray dryer where droplets are formed and rapidly dried, producing dry powder product without requiring prior filtration. This merging of operations eliminates the time-consuming filtration step while ensuring complete separation of the solid material from the liquid medium.
Solution Approach 2:
The patent replaces the mechanical filtration system with a spray-drying system. Instead of using filters, pump systems, and filtration vessels to separate solids from liquids, the process uses atomization and rapid evaporation to directly convert the liquid slurry into dry powder, substituting a thermal-fluid mechanism for a mechanical separation mechanism.
2Reliability
If a high amount of template compound is used during hydrothermal incorporation of titanium, then the crystallization proceeds well, but the overall process duration increases
Solution Approach 1:
The patent optimizes the template compound concentration to a specific range (0.5-1.4 mmol per mmol of SiO2) and adjusts other crystallization parameters including temperature (100-200°C), pressure, and composition ratios. By carefully controlling these parameters, the process achieves reliable crystallization of titanium-containing MWW zeolitic material with the desired framework structure and titanium distribution, while reducing crystallization time compared to conventional methods that use higher template amounts.
Solution Approach 2:
The patent uses a controlled amount of template compound that is sufficient to direct the formation of the MWW framework structure and ensure proper titanium incorporation, but not in excess. This optimized stoichiometry provides just enough structural direction for reliable crystallization without the need for prolonged reaction times that would be required with higher template concentrations.
3Reliability
If multiple separation and drying steps are used, then the titanium-containing zeolitic material can be thoroughly isolated, but the process complexity increases
Solution Approach 1:
The patent merges multiple unit operations (separation, filtration, washing, and drying) into a single spray-drying operation. The spray-drying process simultaneously separates the titanium-containing zeolitic material from the mother liquor through atomization and removes moisture through rapid evaporation, producing dry, isolated powder in one step. This eliminates the need for separate filtration vessels, washing steps, and drying ovens, significantly reducing process complexity.
Solution Approach 2:
The spray-drying system performs multiple functions simultaneously: it acts as a separation device (dividing liquid droplets into fine particles), a drying device (rapidly evaporating moisture), and a product formation device (creating free-flowing powder). This multi-functional approach replaces what would traditionally require multiple specialized pieces of equipment and process steps, simplifying the overall manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly shortens the preparation time, reduces the amount of template compound required, and results in a novel zeolitic material with improved catalytic properties and physical parameters, making it more suitable for industrial-scale production.
Implementation Method 1
incorporating titanium into the deboronated material (ii.2) hydrothermally synthesizing a titanium-containing zeolitic material having an MWW framework structure from the aqueous synthesis mixture
Implementation Method 2
spray-drying the mother liquor obtained from (ii.2) comprising the titanium-containing zeolitic material having an MWW framework structure
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A process for the preparation of a titanium-containing zeolitic material having an MWW framework structure, the process comprising(i)providing a zeolitic material having an MWW framework structure comprising SiO2 and B2O3, (ii)incorporating titanium into the zeolitic material provided in (i) comprising(ii.1) preparing an aqueous synthesis mixture containing the zeolitic material provided in (i), an MWW template compound and a titanium source, (ii.2) hydrothermally synthesizing a titanium-containing zeolitic material having an MWW framework structure from the aqueous synthesis mixture prepared in (ii.1), obtaining a mother liquor comprising the titanium-containing zeolitic material having an MWW framework structure;(iii)spray-drying the mother liquor obtained from (ii.2) comprising the titanium-containing zeolitic material having an MWW framework structure.