Resources & Engineering Library
Technical articles, selection guides, process flow diagrams and downloadable engineering tools. Content is written for project engineers evaluating evaporation and crystallization systems — not for marketing purposes. All downloadable content is provided under project-specific disclaimer.
Recent Articles
In-depth technical writing on evaporation, crystallization and process design. Full catalog lives on the blog — below are the five most recent entries.
Full article catalog: Blog →
Engineering Selection Guides
Structured reference documents for preliminary technology selection. Each guide covers decision logic, key trade-offs and boundary conditions — not catalog marketing.
| Title | Best Used For | Read Time | |
|---|---|---|---|
| MVR vs. Multi-Effect: Total Cost of Ownership Guide | Energy reuse strategy by utility price ratio & CAPEX sensitivity | 12 min | Read → |
| FC vs. DTB vs. OSLO: Crystallizer Selection by Target PSD | Crystal size, fouling tolerance & fines management trade-offs | 15 min | Read → |
| Falling Film vs. Forced-Circulation: Viscosity & Fouling Decision | Heat-transfer configuration by liquid properties & residence-time limit | 10 min | Read → |
| ZLD Architecture for Mixed NaCl / Na₂SO₄ Brines | Salt-by-salt separation sequence, pre-treatment & crystallizer routing | 18 min | Read → |
| Salt-by-Salt Separation Sequence: Salting-out & Cooling Stage Logic | Differential-solubility staging for binary & ternary salt systems | 14 min | Read → |
| Mother Liquor Recycle: Purge Ratio & Impurity Accumulation Modeling | Yield optimization against impurity build-up & product spec drift | 13 min | Read → |
| MVR Retrofit Feasibility: Existing Train Energy Upgrade Assessment | Compressor integration on Effect 1, ΔT envelope, payback sensitivity | 11 min | Read → |
| Cooling vs. Vacuum vs. Evaporative Crystallization by Solubility Curve | Supersaturation method matching the dC*/dT profile of your system | 16 min | Read → |
| Materials of Construction: Chloride, Fluoride & Acid Service Selection | Titanium, duplex, super-austenitic & nickel-alloy routing by chemistry | 9 min | Read → |
PFD Library
Annotated process flow diagrams for reference configurations. Diagrams are schematic and project-agnostic — actual PFDs are developed per project during detailed engineering.
MVR + FC Crystallizer ZLD
Single-train ZLD on high-TDS brine where electric utility is cheaper than steam
3-Effect + DTB Crystallizer
Steam-driven concentration + crystallization for fertilizer-grade ammonium sulfate
MVR Retrofit on Existing Train
Compressor integration on Effect 1 of a 3- or 4-effect train approaching boiler limits
Mixed-Salt Separation Sequence
Differential-solubility staging for binary NaCl / Na₂SO₄ salt systems
Mother Liquor Recycle Loop
Secondary crystallization with controlled purge for impurity management
Vacuum Cooling Crystallization Train
Low-temperature crystallization for thermally sensitive organics (amino acids, citric acid)
Falling Film + Forced Circ.
Two-stage concentration: clean-liquor finishing followed by fouling-prone final-stage
High-COD Wastewater Train
Wet-oxidation pre-treatment + ZLD for pesticide / pharmaceutical effluents
Process flow diagrams on this page are reference configurations for educational purposes. They are not project-specific engineering deliverables and should not be used for construction, permit application or process safety review without re-validation under a formal engineering services agreement.
Engineering Tools & Templates
Spreadsheet-based tools for preliminary project evaluation. Inputs are project-specific; outputs are indicative and require validation during detailed engineering.
Technology Selection Checklist (26 Items)
Step-by-step questionnaire covering feed characterization (TDS, COD, pH, viscosity, main salts, impurities), utility availability (steam pressure, electricity price, cooling water), product spec (PSD, purity, throughput) and site constraints (plot area, altitude, ambient) — outputs a preliminary technology shortlist.
ROI & Payback Calculator (20-Year Lifecycle)
Compares MVR vs. multi-effect CAPEX/OPEX over a 20-year lifecycle, with sensitivity to utility prices, operating hours, compressor maintenance cycles and discount rate. Outputs payback period, NPV and lifecycle cost in user-selectable currency.
Crystallizer Selection Decision Tree
Routes crystallizer configuration (FC / DTB / OSLO) by target d50, solubility curve shape, fouling tendency and required purity. Inputs in first tab; output recommends configuration with key trade-offs and reference d50 ranges for each route.
Process Parameter Reference Table (45 Variables)
Lookup table of typical operating ranges for evaporation and crystallization systems — circulation velocities (FC 2–3 m/s, DTB 1–2 m/s, OSLO 0.02–0.05 m/s), ΔT envelopes, residence times, heat transfer coefficients by evaporator type, and supersaturation operating windows.
Feed Characterization Template (18 Variables)
Structured template for documenting feed TDS, COD, pH, viscosity, main salts, impurity profile, dissolved organics, suspended solids, scaling precursors and other variables required for preliminary process design — with units pre-filled and reference ranges for sanity-check.
Carbon Reduction Estimator (Scope 1 → 2 Shift)
Quantifies Scope 1 to Scope 2 CO₂ shift when replacing part of live-steam demand with MVR electricity on an existing evaporator train. Includes grid emission factors for major regions (CN, EU, US, SEA) and reports tCO₂e/year, tCO₂e/m³ water evaporated, and marginal abatement cost.
Frequently Asked Questions
How the resources library is structured, what we will and will not publish, and how to request project-specific content not listed on this page.
Vendor-published, but written against primary process-engineering references (Bennett & Van’t Land industrial crystallization, Perry’s Chemical Engineers’ Handbook evaporation section, Geertman / Mersmann on crystallization kinetics). Specific industrial operating ranges cited are aggregated from operating references, not catalog cut-sheets. Where we cite an industry-typical figure we identify it as such; where we cite a literature value we cite the source. We do not pretend vendor content is peer-reviewed.
Three reasons. (1) As-built PFDs contain client-specific process conditions and are bound by confidentiality. (2) Reference PFDs on this page are intentionally project-agnostic — they show configuration family (e.g., MVR + FC + crystallizer) so engineers can recognize the architecture, not the specific project. (3) Real as-built deliverables require detailed engineering effort and are issued only under project-specific agreement. If you need an as-built reference, ask us directly under NDA.
No — not as the sole basis. The calculator is a screening tool for preliminary technology comparison (typically CAPEX ±25% / OPEX ±15%). Board-level investment decisions require a project-specific process design, vendor quotations on long-lead items (compressor, heat exchanger alloy), and a formal CAPEX estimate. The calculator’s value is in triaging which route to take to detailed engineering — not in producing a defensible CAPEX number.
The selection guides and comparison tables are reviewed quarterly; the technical articles are reviewed annually. Significant industry developments (e.g., new compressor pressure ratio envelope, new alloy availability, regulatory shift) trigger immediate updates. The "Updated quarterly" tag on the Compare Technologies page reflects this cadence. If you spot a value that looks out of date, please tell us — engineering content degrades fast.
Rarely, and only when those technologies are legitimate alternatives in an evaporation / crystallization selection decision. For example, spray drying appears as an alternative to evaporation + centrifugation + drying in salt-recovery ZLD; we cover it where it matters for selection but do not maintain a spray drying library. Our content scope is bound by our engineering scope — we do not pretend otherwise.
The reference operating data behind the guide figures (e.g., the specific MVR vs. multi-effect break-even electricity / steam price ratio for your region) is shared with serious project enquiries under NDA. The published guides aggregate multiple references into indicative ranges; project-specific data is more useful than the aggregated figures.
Couldn't Find What You Need?
Tell us about your project. We can share project-specific references, PFDs and selection rationale under NDA where the public library is insufficient.